A small plastic quarantine tent sits within a larger tented laboratory. The small tent is surrounded by a circle of powdered Mountain Ash. There is growling coming from within.

A lab-coated man enters, sits at a work table, and begins making notations. He drinks tea while inside the smaller tent a werewolf, oozing black goo from his eyes and mouth, reaches out feebly with a clawed hand.

The man presses play on a cassette player. The voice on the tape says:

"After entering the IP address you will be connected through a darknet portal to an untraceable bank. Once logged in enter your account number to receive wire transfers. The IP address will deactivate..."

The voice continues on a boom box in Scott's bedroom:

"...with each transfer. You will be assigned a new transfer if you choose to continue down the list. Remember, visual confirmation is always required for payment. "

Stiles presses stop on the boom box tape player. He and Scott admit they don't understand what the voice was talking about because they've never had enough money to require a wire transfer. Scott also doesn't understand The Benefactors motivation for using all the Hale's money to kill him and the other Beacon Hills supernaturals.

Scott picks up the money (taken from Garrett's locker) and begins to stow it under the bed. Stiles wants to know what Scott plans to do with the half-million dollars. Scott wants to give it back to Derek but Stiles is hesitant to give the money back. He reminds Scott that the money also belongs to "homicidal killer" Peter Hale. They are interrupted by Malia before they can finish their discussion of what to do with the money. She explains that she and Derek found Satmoi's pack and they're dead.

~~~

Derek arrives at the hospital carrying Braeden. He announces that Braeden's been shot and he thinks she's dying. Selene and Mellisa quickly approach to help.

~~~

Outside the Animal Clinic Deaton is locking up when he senses someone behind him. He whips out a telescopic baton weapon. He turns and swings at a hooded foe. They duck and attack with what appears to be a foot-long metal spike. After a few parries and thrusts, Deaton stops, bows and says "You could have called, Satomi-san." Under the hood, we see Satomi. Her eyes glow red.

~~~

Saturday finds Scott, Kira, Malia and Stiles at school for the PSAT (Preliminary Scholastic Aptitude Test). Lydia and Selene apparently took the test when they were freshmen. Malia is reluctant to take the exam but both Scott says she studied harder than any of them and adds that "while we're trying not to die, we still need to live." He says if he survives high school he would like to go to college, "a good college." Kira points out that the test only takes three hours to complete and "we can survive three hours."

~~~

Each student is required to place their fingerprint on their answer sheet. The security measure is an effort to keep students from paying others to take the test for them. Scott presses his thumb into the provided ink pad and applies it to the paper. He is then handed a booklet by a teacher who we can see is the same man we saw in the lab at the beginning of the show (The Chemist).

Students are also required to give up their cell phones for the duration of the test. Natalie Martin (Lydia's mom) takes each phone and places it in an individual, numbered envelope.

The test is supposed to run for 2 hours and 10 minutes. "The Chemist" explains that it consists of "two 25 minute critical reading sections, two 25 minute Math sections and an essay writing portion that will last 30 minutes."

He then turns to Natalie Martin and says there should be two teachers monitoring the exam. She explains that Coach Finstock is not exactly punctual. She steps into the hall to try to call him again. She notices his office door at the end of the hall and decides to check there. She finds him passed out on his desk and believes he is drunk. She's disappointed, saying he has "15 years of sobriety" and falls off the wagon at school. She tries to revive him but has no luck.

Natalie Martin reports to "The Chemist" that she can't find Coach but offers instead to get Mr Yukimura who is upstairs grading papers. He says they need to start the test but will seek out the other teacher during the first break. He starts the test.

Scott seems to know the answers and is quickly filling in the bubbles on his answer sheet. Stiles seems surprised by one of the questions while Malia seems stumped by the whole process. A girl sitting over one row and behind Stiles collapses to the floor (Natalie calls her Sydney). Mrs Martin notices a pattern of red and white welts on Sydney's arm. The girl says she doesn't know when the rash developed.

Natalie says everything is fine and the girl sits back down to resume the test but then Mrs Martin takes her phone and orders that no one should leave the room. She immediately goes to Coach's office and checks his wrists. There is no rash on his arms. She then lifts his shirt and finds his back is covered with large red and white welts.

She steps back into the hall and seeing several students entering the school from the opposite end of the hall she screams at them to get back outside, running down the hall to lock the door behind them. Hearing the commotion in the hall, the students taking the PSAT, including Scott, rush outside. She shouts at them to return to their seats. Once they're gone, she dials operator assistance on her phone seeking the number for the Centre of Disease Control.

~~~

Agents with the CDC, dressed head to toe in yellow biohazard suits, enter the school. They proceed to set up a quarantine area in one of the larger classrooms. They have two rows of beds. Each is covered by a clear plastic tent. The outside of the school is also covered in clear plastic.

Stilinski arrives outside the school. Bio-suited men and women are rushing back and forth. He asks one CDC worker for an update. She says the incident is a "hopefully a false alarm" but that the details provided have concerned the CDC and local health authorities enough to order a quarantine. He tells her that his son is in the school which he says won't be a conflict but is stressful.

~~~

While tending to Sydney, Natalie explains to Scott that they are planning to isolate the sick and wait for instructions. She says if she's wrong the CDC will be out pretty quickly and she'll be "the crazy biology teacher who panicked for nothing."

Sydney is very upset, Scott assures her that she will be okay but she is not worried about her health. Sydney is worried about the PSAT because it is the qualifying test for the National Merit Scholarship and without it, her parents can't afford to send her to college. Scott says he's sure they'll let her take it again.

~~~

Stiles tells Malia and Kira that he heard the CDC thinks it is Smallpox. The Chemist, who is eavesdropping, says that is not likely because Smallpox is one of two viruses that have been completely eradicated from the planet. He says the other extinct disease is Rinderpest.

Malia tunes her enhanced hearing on the workers outside the school. She tells Stiles they seem to be taking it very seriously and that his dad is there. Stiles says he should call him and reaches for his phone but The Chemist says the phone won't work because CDC shut down all communications around the school to avoid a public panic.

~~~

Satomi and Deaton bring one of her sick male Betas into the animal clinic. She explains how the disease progressed in her pack. It starts with fever followed by uncontrolled shifts including "full unwarranted transformations," trouble standing, and sudden blindness. After the victims lost their eyesight, they had only a few minutes left. Satomi explains that they moved into the woods during more of her pack became ill.

Deaton says they need to get him to a hospital. Satomi says that's never really been "an option for our kind." But Deaton says he knows someone who can help.

~~~

Melissa and Selene exit the elevator at the hospital. They walk past a blond girl sitting in a chair in the hall crying softly. They head into Braeden's room and begins to inject something into her IV.

"What's that?" Derek asks.

"Naloxone. We need to wake her up" Selene explains.

"I thought you said she needed to rest?" Derek asks Mellisa.

"That was before I found out the CDC just put the high school under quarantine with Scott and Stiles still in there" Mellisa explains and Braeden shoots upright in the bed.

"Braeden, look at me-- you were shot, but you're in the hospital, and you're fine. Do you understand?" Selene asks and Braeden nods.

"Good. Okay... Last night, you were in the woods, and you came across another pack? Do you know what happened to them?" Mellisa asks and Selene frowns.

"I told you, they were poisoned-" Derek says.

"-No. No, they were infected. It was a virus... designed to kill Werewolves. It did. It killed them all. " Braeden cuts him off.

~~~

Natalie is knocking on the locker room door. Scott is inside and can no longer control his shift.

~~~

Lydia has returned to the white room in her Grandmother's lake house with a box of Meredith's possessions from Eichen House. She lays them out on the white carpet. First a nearly empty bottle of perfume with an old-style atomizer bulb attached. Then comes a dried bouquet of flowers tied with a pink ribbon followed by a stuffed dog stuck to a photograph.

She starts the red record player and while the static flows from the speakers she addresses Meredith. She explains that she's not a psychic and not much of a Banshee but that she wants desperately to help her friends. She also says she's sorry that she couldn't help Meredith.

Frustrated, she snatches the needle from the record and begins stuffing Meredith's belongings back in the box. As she picks up the stuffed dog, she notices the photograph stuck to it. Looking at the image she realizes that the picture of Meredith was taken in the same room where she is now. The black and white image shows the edge of the record player, the wall outlet and one of the sconces inside the white room in her grandmother's lake house.

~~~

Mr Yukimura comes into the locker room. Scott, partially transformed, tells him to get Stiles.

~~~

The CDC is taking blood from each student. In line for their turn, Malia asks Kira if she ever gets the feeling Scott and Stiles aren't telling her everything. She's talking about what Scott has hidden in a bag under his bed. Kira is quick to point out that she's never been under or in Scott's bed. She says she's been on it "wearing clothes."

When it's Kira's turn to get her blood drawn, lightning shoots up the needle and burns the CDC worker's hazmat suit. Other workers rush her outside, checking for a hole in the suit but she says it just scorched the top layer. She brushes it off as "static electricity." Malia rushes Kira away from the other students.

~~~

Sheriff Stilinski and Agent McCall question the CDC worker about the situation. But she smarts off at them that since both their sons are inside, they can debrief each other. McCall also heard that it was smallpox. The Sheriff says he thinks another assassin is a work.

~~~

Scott's eyes are still flashing back and forth from normal to red. Malia's claws won't retract. Mr Yukimura says the virus is affecting them in a way it won't hit humans. Stiles says they have to stay out of sight but they have trouble deciding a spot in the school that will hold them. They think maybe the basement but Scott says there are "too many ways out." Stiles suggests they use the vault. They decide that the Hales would have an escape route somewhere inside the school.

Using a set of blueprints of the school, they figure out where the vault must be in relation to the rest of the school. Mr Yukimura suggests it would probably be accessible from the basement. Stiles collapses. He has developed signs of infection on his hand. Mr Yukimura says they're all getting sick. Kira says she doesn't feel sick but he says it is affecting her neurologically. He shows her the answer sheet from the test and it looks like she tried to fill in the bubbles but kept missing them. Her marks are all over the page.

They head down to the basement and quickly find the triple spiral of triskelion a carved into the way with a familiar metal grate in the centre. Stiles says it opens with anyone's claws. Scott shakes his head "no" but then realizes that his friend doesn't want him to say out loud that the vault opens only to The Hale Family. Instead, Scott lies and asks Malia to do it because he says he's lost control of his shift.

Malia says she will do it but first, she wants them to tell her what they've been hiding from her. They think she means the secret about Peter but instead she provides them with an out saying that she knows she is on the Benefactor's list. She wants to know how much she is worth. They tell her $4 million. She seems okay with this information. When questioned she says Scott is worth $25 million and Kira is worth $6 million so 'they'll take you guys out way before me.

Malia inserts her claws in the wall grate and twists. Light comes from the door lock as the mechanism recedes into the wall and the door opens. The four enter the vault and door closes behind them.

~~~

Deaton and Satomi arrive at the hospital with the sick beta and Selene's face shows both relieve and sadness.

"We need to get him upstairs" Selene immediately says and Mellisa nods. The beta vomits black goo.

"Okay, this isn't happening at the school, is it?" Mellisa asks."School? It's a Saturday" Deaton replies confused.

"They're taking the PSATs. And Mellisa, I think you know the answer to that. Now come on, we need to hurry" Selene explains and they rush into the elevator. The beta dies in there. Satomi cries and Selene comforts her.

~~~

In the vault, Malia lays in Stiles' arms. Kira paces while Scott sits quietly. Kira notices a jar on a shelf and picks it up. They discuss how to changed bearer bonds into cash saying that type of currency is almost obsolete so getting money for them would require a bank.

Stiles goes on to discuss how the bonds were just gathering dust down there and points out how many problems the money could solve for everyone. He says the Eichen House bill and the cost of the MRI he had are crushing his father. Scott explains that Melissa does this thing where she writes down all the stuff in their budget, adds it all up, and figures out how much longer they have until they lose the house.

~~~

Lydia arrives at the school as night falls. The sheriff allows her past the police line.

~~~

In the vault, Scott is listening at the door. He says "they're looking for us" and decides that someone will have to go outside. He looks to Kira and Malia who are huddled together on the floor. Scott says they need to tell Malia the truth about Peter being her father. Stiles baulks and points out that Peter's name is not on the list. This makes him "either incredibly lucky or The Benefactor."

He says if Malia finds out about him she will go after him and Peter will then "twist his way in" like he does with everyone. Stiles chastises Scott for letting Peter walk around like nothing happened, "like he's one of the good guys." Stiles is emphatic that Peter is NOT one of the good guys. He says if Malia finds out about him she is gone and that is probably what Peter is counting on.

~~~

Deaton, Selene and Mellisa perform a craniotomy on Satomi's dead beta.

"I think I know what this is... Unfortunately, if I'm right, and Scott and the rest are infected? It's not good... They're going to die without an antidote"

~~~

Stiles explains to Malia that he is leaving them. He gives her his jacket. He promises that he's coming back because he'd never leave her behind. He kisses her forehead and she smiles.

~~~

Derek is smiling as he watches Braeden sleep. She wakes and he jumps up from the bed. She wonders why he is still there and he claims he is protecting his investment. Melissa brings in Satomi.

~~~

Lydia tells the Sheriff that someone is going to die inside the school. She is certain.

~~~

"It's a variant of canine distemper. A few years ago, an outbreak in Yellowstone killed forty-per cent of the wolf population" Deaton explains.

"What's it going to do to our wolf population?" Mellisa asks

"Well, it's been altered to infect quite a bit faster..." Deaton explains.

"You mean it's been weaponized" Selene corrects him.

"It infected my whole pack..." Satomi says.

"Everyone except you. Mom, that's the real question-- did you not get infected? Or are you immune?" Selene asks Satomi.

~~~

Stiles is looking for Mr Yukimura in the CDC's triage area. He spots coach and realizes that he is the only adult to become infected.

~~~

"If your pack was infected, then who was doing all the shooting at the entrance to the woods?" Derek asks.

"Apparently, another assassin. Personally, I'd rather face a gun than a variant of smallpox..." Satomi says. She looks at Derek.

"Sounds like you're going to get plenty of chances" Mellisa mumbles under her breath. Derek notices Satomi is looking at him.

"Sorry... I just noticed how much you remind me of Talia. I used to visit her a lot, you know... Do you remember me?" Satomi explains her staring.

"I remember the tea. You always brought that tea that smelled horrible" Derek says and this seems to poke Selene's interest.

"What kind of tea?" Selene asks.

"What?" Satomi asks confused.

"The tea with the smell, what kind was it?" Selene asks.

"Reishi-- wild purple reishi. It's very rare. Why?"

"It's also a powerful remedy for sickness. Mom, you didn't get infected because you've been inoculated"

"Okay, okay... How rare is it? Can we find it?" Mellisa asks.

"We don't have to. My mother kept some of it... It's in our vault" Derek explains.

~~~

The jar Kira picked up earlier is apparently full of reishi pieces. Malia is lying on the floor. She reaches into the pocket of Stiles jacket and removes a piece of paper. Scott, realizing that it is the third part of the Dead Pool, moves as if to stop her as she unfolds it. Malia can't read it because she has been struck blind by the virus. Scott too is losing his eyesight.

~~~

Stiles tears through coach's office looking for something that might have caused him to become ill. He finds nothing but does notice a stack of Permission Slip/Liability Release Forms. The top few are stamped with "APPROVED" in red but midway through, the colour becomes fainter and fainter until coach changed to black ink. Stiles notices black ink fingerprints on a coffee mug and remembers how each student had to ink their thumbs before taking the PSAT. He realizes that the ink pad was the source of the outbreak just as The Chemist steps into the room with a handgun.

~~~

Coach wakes up in the isolation area and seems fine. All the students begin to recover as well. All signs of the virus are gone.

~~~