Agent McCall is managing a secure patient transfer to and tells the ambulance driver to go around back and to keep quiet about the identity of the patient.

Inside the emergency waiting area, Selene is adjusting a jack-o'-lantern and laughing with Mellisa when they catch sight of Mellisa's ex-husband and Sheriff Stilinski on a collision course.

"Oh, here we go" Mellisa mumbles.

"Hey, he's not coming in," Sheriff Stilinski tells Agent McCall.

"It's the only hospital that would take him," McCall says.

"What about County?"

"You'll be surprised how fast things fill up when this kind of guy needs surgery"

"They turfed him to us?" Mellisa asks while Selene looks confused with the situation.

"Yeah," McCall says.

"If County didn't want to operate on him..." Sheriff starts.

"Then someone has to" McCall cuts him off. The patient is rolled in past the McCalls, Selene and the Sheriff; his feet and arms are strapped down with thick padded cuffs of leather.

"Somebody needs to do his pre-op interview" Selene realises. She's been helping Mellisa in the hospital.

"Who usually does that?" McCall asks. Mellisa and Selene look at each other and sigh. They turn to the Sheriff and Special agents.

"We" they say in sync.

~~~

In the school locker room, Stiles is lurking with a flashlight while talking to Scott on the phone. It's fifteen minutes after midnight, officially "Mischief Night/Day," and Stiles says it is a tradition to prank Coach. October 30th is also Coach Finstock's birthday.

Stiles is frustrated that Scott isn't there yet. Scott claims to be in bed already but then suddenly appears behind Stiles with eyes aglow, frightening him badly.

"I hate you"

~~~

"Try to keep in mind exactly what this guy is capable of. He's a former electrical engineer who decided to walk onto a school bus with a shrapnel bomb. He left four students dead, and a fifth with no legs" McCall explains while he, Mellisa and Selene are walking towards the patient's room.

"Just out of curiosity. Have any psychiatrists made any progress?" Selene asks.

"I'm told he says the same thing almost every day. That when he gets out he's gonna do it again. ANd this time he's gonna get it right" McCall explains.

~~~

Selene is looking over the medical files while Mellisa questions the patient. William Barrow - 05/24/60 – 6ft 2in – 155lbs and includes spaces for blood pressure readings as well as a number of rote questions about other issues. Melissa reads from the form asking if Barrow understands that scar tissue has formed around a piece of shrapnel that "remains in your body from a previous injury and that it is now blocking vital functions?"

She then explains that they will put him under general anaesthesia tomorrow morning for the surgery to remove the obstruction. Instead of answering her questions, Barrow asks if the kids still pull pranks the day before Halloween. Melissa calls it Mischief Night but Barrow says where he's from it was known as "Hell Night."

"Do you have any allergies to any medication?" Selene changes the subject. Barrow turns to her.

"No" he says

"Are you taking any other medication than the ones listed here: Temazepam, Divalproex" (Temazepam treats insomnia and Divalproex treats seizures and manic episodes.)

"I just take what they give me"

"I'm going to need to listen to his heart" Mellisa says. When she leans in to listen to his heart, he leans up.

"Why don't you just ask the question you really want to ask?" Borrow asks.

"Why did you do it?" Mellisa asks. Selene takes a deep breath awaiting the answer, she has to admit this guy makes her uncomfortable.

"I saw their eyes. There eyes were glowing. I saw them" Borrow whispers and Selene starts to walk closer and closer to Mellisa, not trusting this to go well. "I saw their eyes!" Borrow suddenly pulls at his restraints and Selene has Mellisa pushed behind her in a second. Barrow continues to yell about glowing eyes and pull at his restraints.

~~~

Scott and The Twins arrive at school on their motorcycles at the same time. Scott wonders if they've reenrolled in school. the twins say they just wanna talk and Stiles arrives at that moment pointing out they're more the 'fight first, ask questions later' type. Selene arrives, still spooked about what happened yesterday when Stiles yells at her to join the conversation.

"You need a pack, we need an Alpha" Aiden says.

"Yeah, absolutly not. That's hilarious though" Stiles replies.

"You came to us for help, we helped" Ethan points out.

"You beat his face into a bloody pulp. That's not helping. In my opinion that's actually couter-productive" Stiles counters.

"Why would we say yes?" Scott asks.

"We'd add strength" Ethan says and Selene rolls her eyes.

"We'd make you more powerful. There's no reason to say no" Aiden agrees with his brother.

"I can think of one. Like-" Isaac starts but sees Selene glance at him in a 'don't start a fight' kind of way. She turns back tot the twins.

"There's strenght in loyalty, not numbers. And I don't know if we can trust you" Selene says and tarts walking inside the schoolbuilding.

"Neither do I" Scott says and follows Selene inside, Stiles and Isaac directly behind.

Aiden thinks they should reenroll in school to show Scott they are serious about being better people. He says they have to do something because they are now and the people they screwed over will come looking for them because they're weak. Ethan says being dead would be better than going back to high school but then sees Danny talking to his ex-boyfriend and acquiesces. He still refuses to take math and Aiden says he'll take it for him.

~~~

Inside the school, chaos reigns with rolls of toilet paper flying through the air and kids running up and down the halls. Scott stares at Kira as she places items into her locker. When Stiles asks about it, Scott says he likes her, "She's okay. She's new."

Stiles suggests he ask her out but Scott demurs. Stiles pushes saying Scott, as the Alpha, is now the "Apex Predator." He says everybody wants Scott describing his as "like the hot girl every guy wants."

"I'm the hot girl?"

"You're the hottest girl" Stiles leaves.

"What?" Selene and Isaac ask at the same time.

"I'm the hot girl" Scott repeats

"Yes you are." Selene and Isaac agree. All three chuckle before Scott walks away to class.

"I wish I was there to see Coach's reaction" Selene says while walking towards math with Isaac.

"What's wrong?" Isaac says noticing the absendmindedly from the female Alpha.

"Have you ever heard of William Barrow?" she asks.

"The guy that blew up the school bus a couple years back?"

"Yeah, they're operating on him today and yesterday when I was helpinf Mellisa out we had to do the pre-op intervieuw" Selene says and swallows. "He scared the crap out of me. But he... he said he did it 'cause he saw the children's eyes glow"

"He could've imagined it. It could have been normal people-"

"It weren't. The school bus, a friend of mine was on it. They say it's a miracle she survived"

"It doesn't matter. They will keep a close eye on the guy. There's no way he's gonna escape"

"I know, it's just... I feel like something is about to happen. Something that's going to change us forever, and it's gonna happen right under our nose"

~~~

Entering his office, Coach Finstock is prepared to be pranked. He looks for hidden wires or a bucket suspended over the door. He finds a wrapped box on his desk and pokes at it with a lacrosse stick. Satisfied that there are no obvious booby traps, he opens the box. Inside are screws. The coach is amused, thinking this is a poor prank, but the box is attached to a hidden wire and, when he lifts it, all of the pictures and shelves fall off his walls. Apparently, the screws inside the box had formerly been holding them securely in place. He sits down in frustration but the pranksters have removed the screws holding his chair together as well and it collapses under his weight.

His cry of "Son of a bitch!" echoes out into his classroom where Scott and Stiles smile and the rest of the class laugh.

Finstock enters the room on a tear, railing against Mischief Night and Halloween. Apparently, his house gets egged every year. Again, he sees a wrapped gift on his desk. Thinking it is another prank he throws the box on the floor and stomps it. Hearing glass break, bends down to investigate and finds a broken coffee mug adorned with his picture and the caption "#1 Coach". An attached card says "Happy Birthday|Love, Greenberg."

Lydia is waving her arm around, swatting at the air. She hears a fly but Danny, watching from across the classroom sees there is nothing there. Lydia looks toward the ceiling and the sound of flies becomes a more uniform buzz.

~~~

In the operating suite at Beacon Hills Hospital, Barrow is in the middle of surgery. The doctor jokes that he should make a minor slip and let the SOB bleed out on the table. Something inside Barrow's open wound is pulsing, getting bigger until it finally bursts open and flies swarm out into the room. Barrow wakes from the anesthesia, grabs a scalpel, and goes after the doctor. By the time Sheriff Stilinski and Agent McCall arrive, the murderer has escaped and the doctor is bleeding out on the floor in Melissa's arms.

~~~

Back in his Beacon Hills loft, Derek opens the container they retrieved with Liz, Luke and Diana and pours four werewolf claws onto the table. He explains that after the fire, the claws were all that was left of his mother, Talia Hale . He expects Peter to insert his dead sister's nails underneath his own and then plunge them into Derek's neck so that Derek can ask his dead mother a question.

The wooden container in which the claws were kept was apparently specially designed for this purpose as it has four finger holes in the bottom. When Peter jams his hand inside the claws will be driven into his nail beds.

~~~

Melissa explains to the Sheriff about the flies. She says there is a natural phenomenon called Myiasis in which bug larva, like maggots, can grow inside a living human but says it's not likely in the stomach. She also clues him in to why Barrow attacked the "teenagers" on the bus. The Sheriff immediately recognizes the significance of the "glowing eyes" reference.

Agent McCall says they got a tip that the stolen ambulance, presumably Barrow's get-away vehicle, was spotted at the corner of "Truman and Spalding" which the Sheriff says is just three blocks from the school.

~~~

Aiden approaches Lydia in hallway. She gives him a curt speech about how there is no way he can give her "two weeks of nothing" then come back and expect that they'll instantly be in Coach's office ripping each other's clothes off.

One second later they are wrapped in each other's arms, stumbling into Coach's office. The come up for air long enough to realize that the desk is broken (another side-effect from the prank) and decide to use the Guidance Office instead. As they close the door, we see William Barrow was standing behind it, inside the office, the entire time.

Barrow picks up a staple gun from the floor and begins to staple his wound closed.

~~~

The FBI and the Sheriff's Department seal off the school. Stiles clues in Isaac, Allison, and Lydia about Barrow's motive for attacking the bus and his escape from the hospital saying the "live flies" thing would be awesome under any other circumstances. Lydia picks up on the bit about the flies, saying she has been hearing the constant buzzing like flies all day. Allison heads off to research the while Stiles and Lydia look for Scott.

~~~

Kira and her father are in his classroom eating lunch. Kira is taking pictures of her father with a bright yellow Nokia Lumia 1020.

The quote on the blackboard during this scene -

"History will be kind to me for I intend to write it." - Winston Churchill

Mr. Yukimura asks why Kira is sitting with him instead of eating in the cafeteria with other students. She explains that she hasn't made any friends yet and doesn't really understand why. She says she had friends at her old school but in Beacon Hills, every time she opens her mouth she "starts rambling like an idiot."

Mr. Yukimura quotes lines - "Try again. Fail again. Fail Better." These are from a prose piece called Worstward Ho. The choice of this particular piece, which Mr. Yukimura jokingly attributes to Yoda, is significant given what we know already about current events in Beacon Hills. Beckett gives us an unseen narrator urging himself onward through semi-darkness while all the time "shades" loom half-seen in the gloom. Some have compared it to Paradise Lost suggesting that Beckett's narrator is in Hades.

Her father tries to reassure her that "someone will show an interest" because she is beautiful. Kira jokes that the only one to show interest is a coyote. Mr. Yukimura counters that she can date the coyote. Kira confesses, with Scott listening at the door, that she doesn't want to date and doesn't want a boyfriend. She "just wants to make a few friends."

Stiles and Lydia catch up to Scott and explain about Barrow's escape. Lydia says she can't hear anything except for the buzzing now.

~~~

Stiles tries to convince his father that the police shouldn't leave because Lydia has a supernatural feeling about Barrow still being at the school. Sheriff Stilinski is confused pointing out that "Lydia wasn't on the chess board". When Stiles says she's now on the board, his father wonders aloud "Kanima?" Stiles corrects him and says she is a Banshee which he says means she can sense when someone is close to death. The Sheriff says he has to go with eyewitness over Banshee and leaves the school taking all but a handful of deputies with him. The school is on lock-down until 3PM.

~~~

Melissa brings Barrow's personal effects to Scott at school. She urges him to be careful because she looked right into Barrow's eyes and "it was terrifying." He promises to be careful and kisses her on the forehead.

At the door to the school basement, Scott meets up with Aiden, Ethan and Isaac. The plan is to use their to track Barrow at the school. Allison has to sneak out of school to get home to search the Bestiary. She says it's like "a thousand pages long" and she could be searching all night. Lydia tells her the word for flies in archaic Latin is "Muscas" and Allison climbs out the window of one of the classrooms.

It's 2:35 PM when Stiles and Lydia begin their search "upstairs."

In a basement hallway, Isaac questions Scott about trusting the twins to help with the search. Scott says just because he's working with them doesn't mean he trusts them. Isaac confesses that he hates them and wants them to die. Scott points out that with Barrow around he might get what he wants. This makes Isaac smile.

On what is labeled the "EAST" hallway in the basement, Aiden and Ethan search together. Ethan apparently hears something and they pause before jumping around a corner. Danny and his ex-boyfriend (Damon Jackson) are standing there kissing. Aiden laughs at Ethan who can only say "oh really" in a choked voice. Danny looks a little sheepish while his ex looks away.

~~~

In the art classroom, Lydia and Stiles continue their search. Stiles explains the plan in which Scott and Isaac will search one end of the basement while Ethan and Aiden search the other. They plan to meet in the middle in the boiler room. Seeing a picture of a nuclear mushroom cloud, Lydia realizes that all the kids with glowing eyes are heading to the boiler room. Stiles realizes Barrow, as an electrical engineer, would have the ability to turn the boiler room into a bomb. He pulls the fire alarm to evacuate the school and gets himself into trouble with Coach Finstock who says if he were "four years younger" he would punch Stiles.

Scott and the other wolves join Stiles and Lydia. It's now 3:00 PM and school is over. They all look to Lydia to see if everyone is safe but she says she doesn't know. Selene and Cheryl approach them.

"What's wrong?" Selene asks.

"Barrow escaped" Stiles says.

"Barrow? Schrapnel Bomber Barrow? The guy who almost blew up Liz-!" Cheryl yells and Selene covers her mouth.

"Keep your voice down. Not the whole school has to know. Is everyone safe?" Selene asks.

"I don't know" Lydia states again.

~~~

In the library, Kira has her earbuds in and can't hear the fire alarm. Coach Finstock gets her attention and forces her out of the school. In the next row of books over, William Barrow is watching as Kira exits.

~~~

Peter is reluctant to help Derek with the claw thing. He say he do it if he's allowed to keep Talia's claws when they're done. Peter says he'll do it but hesitates and Derek forces his hand into the cylinder.

At Kira's house, Mr. Yukimura has invited Selene over for dinner.

~ ~ ~ ~ ~

"So, Selene, I'm sure that as a native Californian, you've eaten at some pretty impressive Japanese sushi restaurants. But I have to tell you my husband is a superb chef" Mrs Yukimura explains.

"Okay, we have: Hamachi, Uni, Ikura and Hirame" Mr Yukimura says pointing at each of the kind.

"I looks delicious" Selene says with a smile. Everyone takes their chopsticks and starts to eat.

~~~

Lydia is lying on Stiles' bed. He has constructed an elaborate (some might say obsessive) murder board on two walls of his bedroom. Stiles connects a red piece of yarn from a picture of William Barrow to a picture of the high school. Lydia asks what each different color string means. Stiles explains that each color represents a different stage of the investigation, green is solved, yellow is "to be determined" and blue is just "pretty." Lydia asks about red and Stiles says that means unsolved. She points out that he only has red string on the board.

Stiles says he has detention every day this week for pulling the fire alarm. Lydia begins to doubt herself because they couldn't find any trace of Barrow being at the school. Stiles comforts her, saying she's been right every time something like this has happened. Lydia points out that the werewolves couldn't find a scent and there was no bomb but Stiles persists, adamant that Barrow was there because Lydia felt it. He then removes the top from a felt tip marker and sniffs. This causes a realization and he jumps up heading for the school.

Allison searches the pages of the bestiary on her computer. She hears a noise like someone walking, then a sizzling sound and a high pitched yelp followed by another, equally high pitched, cry.

Isaac appears in the doorway. He points out that Allison has electrified the windows and didn't tell him. Allison is amused by this. She wants to know why Isaac came; he says he is there to help, then admits Selene asked him to. Allison wants to know if he can read Latin, he can't but says he can look at pictures. They click over to the next page of the bestiary and are confronted by a drawing of a classical Japanese devil mask.

~~~