Casey jolts awake from a nightmare of a biter attacking her face. Still dreaming, she believes it is real when Blake comforts her at her bedside; the moment nearly escalates to a kiss before she truly wakes.

Blake rips off her sheets and orders her up for training. When she resists, he dumps water on her. Casey chases and pins him to the wall, but he reverses the hold. A flashback surfaces: teenage Casey and Blake sharing a late-night picnic by a firepit, culminating in their first kiss. In the present, the two fight, with Blake pinning her to the ground until she agrees to train. He releases her and leaves, saying his goal is to keep her safe.

Casey joins Blake outside before dawn, and they go on a two-mile run. Casey sprints to catch him but exhausts herself quickly, as Blake waits with water and ensures her she will progress quickly. When Casey tries to return to bed, several others arrive for group training. Blake orders everyone to line up and announces hand-to-hand combat practice. He selects Casey to demonstrate taking him to the ground. She tackles him mid-instructions, then in a second round gets him in a choke hold. Blake stands despite it, breaks free, and throws her down. Casey demands another round and knees him in the groin, but he pins his weight on her chest. He warns her she is still not ready.

Casey sits alone at the burn pit, watching flames consume Chris’s remains hours after his funeral. She cannot pull herself away from the fire. Dale joins her. He apologizes, noting the death likely triggered painful memories.

A flashback overtakes Casey: In 2006, 10-year-old Casey hears a break-in. Her mother screams and orders Casey to run. Casey opens the kitchen door and witnesses a man in black repeatedly stabbing her mother. The attacker and his accomplice flee. Casey’s mother, bleeding heavily, tells her to run a mile to the neighbor’s house for help. Casey pounds on the door until an older woman, Elaine, answers and lets her in. By the time an ambulance arrives, Casey’s mother is dead.

Back in the present, Dale tells Casey it was not her fault, while she assures him that it was not his, either. They exchange reassurances, though neither fully believes them. Dale cries openly for the first time since his wife’s murder. Casey confesses she lied about staying away and admits she resented and hated him for her regimented upbringing. Dale apologizes and says his “world ended” when Casey’s mother died (133).

Blake approaches and reports that Chris was scheduled for night watch. Blake volunteers to cover it, but Casey insists she will do it. Blake starts to argue she is not ready, but Casey cites disarming JJ and knowing the property. Dale requires Blake to show her the routine. Casey relents, and they head out together.

Casey conducts a perimeter patrol, weighted down by multiple weapons. Blake shadows her, offering basic instructions she finds condescending. She mocks his needless reminder to turn right at a fence corner. Blake explains proper patrol means walking the full “property line” to check for “weak spots,” stressing the importance of it to keep everyone safe (137).

Casey insists she does not need Blake to show her the sniper tower since she and Dale built it. Blake catches up and agrees to follow her lead. Casey distrusts his sudden compliance. As they walk in silence, Blake mentions he liked what she said to her father. When Blake starts to reference her mother, Casey cuts him off, refusing sympathy.

They reach the tower in silence. Blake discloses he also lost his mother to cancer and that he and his father moved to Wisconsin for a fresh start. Casey offers sympathy but notes her distrust in his motives for telling her. They discuss how lasting grief is.

Blake shifts back to instruction, pointing out the upgrades he and Dale made. He summarizes the night watch routine: patrol, then remain in the tower. Blake asks if Casey can handle the rest of the night and, when she confirms, he warns her not to get everyone killed. Casey smiles as he leaves.

During her third patrol, Casey reflects on Blake’s disclosure about his mother and refuses to accept it as justification for his past cruelty. A possum startles her, then a branch snaps in the forest. As Casey bends to retrieve her dropped flashlight, Blake tackles her from the side and covers her mouth. He claims he is testing her reflexes and could not sleep knowing she was on watch. Casey tries to get him off, but instead, he kisses her. Casey does not resist and kisses back and escalates it.

Casey flashes back to high school. At a party, a phone call changes Blake’s demeanor. He publicly humiliates Casey, calling her “Doomsday” and mocking her, declaring he could never be friends with a “freak” (146). The crowd laughs as Casey flees in tears.

Casey jerks away in the present and demands to know why Blake kissed her. He starts to say he likes her, but she stops him, accuses him of repeating his high school manipulation, and walks away. Blake spins her back and kisses her again. Casey pulls away and slaps him hard across the face. She warns him never to touch her again and storms toward the house, refusing to look back despite nearing tears.

The morning after the kiss, Casey finishes a run exhausted and sits in the grass. The scavenge truck returns. Blake exits and softly approaches Casey, saying he got her something. He produces Sour Patch Kids, her favorite candy. Casey recalls a teenage movie date when she compared the candy to Blake being sour then sweet. She claims she now hates them and refuses the gift.

Greg passes carrying a box. Molly asks if he got her anything. Greg coldly says no. Casey blurts that Greg does not like Molly, explaining she was meant to be a one-night stand but is “stuck” due to the apocalypse. Molly sobs and runs inside. Casey insists Molly “deserves to know the truth” (152). Tessa asks if something is wrong so Casey admits Blake kissed her. She lies, claiming she immediately slapped him, and accuses Blake of trying to manipulate her again. Tessa suggests Blake might have changed, but Casey challenges Tessa’s loyalty so Tessa backs down.

Casey goes inside to shower. A loud crash comes from the first-floor bathroom. Casey knocks, receives no answer, and enters. She finds Elaine unconscious on the tile with blood pooling around her head. Casey screams for help.

Casey confronts the group at a table, demanding to know how no one knew Elaine is diabetic. She has been rationing insulin unsafely and will run out in two days. However, everyone insists they had no prior knowledge. Dale explains Elaine never disclosed because she avoids “burdening” others.

As they discuss what to do, Blake and JJ confirm that most pharmacies have been empty for a long time. Casey suggests hospitals, which have their own pharmacies. However, Dale refuses, arguing that they are filled with biters. Casey acknowledges the risk but points out that Elaine will certainly die without their help.

Despite Casey’s argument, Dale continues to say no, pounding the table in anger. When no one objects, Casey volunteers to go alone, and Blake offers to go with her. Casey yells at Dale and invokes what her mother would do, and Dale finally relents. The group then argues about who will go, with Blake claiming that Casey is their best option because she knows hospitals. In the end, they draw straws for who will stay behind, and Dale and Uncle Jimmy lose. Casey assures her father that he is the best one to defend the compound. When Blake promises he will watch over Casey, Casey insists she can protect herself.

The next day, Blake, Casey, JJ, and Greg arrive at Meadow Crest Hospital. Blake uses binoculars and counts six biters at the back entrance. The group chose this route after seeing many biters at the front. Casey volunteers to take two at distance with throwing stars to reduce risk. Blake warns missing could draw attention, but Casey promises she will not miss. The team advances in a crouched line, splits into positions, and strikes on Blake’s signal.

Casey’s first star kills one biter. The second target ducks to feed, and her star shatters a glass door panel. The surviving biter spots Casey and charges, letting out a high-pitched scream. Blake kills it with a thrown knife before Casey must fire her gun. He tells her teams account for mistakes and urges her to keep her head in the game.

Blake leads them into the hospital but freezes in the hall, seemingly unnerved by the hospital’s death and destruction. JJ touches his shoulder; Blake startles and pushes onward. Greg asks Casey a pre-death question about Molly. Casey confirms she told Molly the truth and defers further discussion to focus on survival. JJ proposes splitting: He and Greg go to the cafeteria for food while Blake and Casey go to the ICU where Casey is adamant the medicine will likely be. Casey protests pairing with Blake but loses rock-paper-scissors to Greg.

On the third floor, the ICU hall is more decayed, with piles of corpses and starving, immobile biters. Casey loots a doctor’s badge to access the locked pharmacy. A hidden biter slams Casey into the wall, shrieking. Blake kills it before it bites her. They argue about her lingering anger. Casey badges into the med room, finds over 25 bottles of insulin in a cold cabinet, and packs them along with many other prescription medications. She exits expecting Blake but finds him missing. Casey discovers Blake frozen again in an ICU room doorway, staring at an emaciated biter. The sight of the wasted creature seems to trigger a traumatic memory, and she tries to yank him away, but he stays rigid. Casey screams his name at full volume. Blake snaps back to awareness and turns as the biter lunges. The biter sinks its teeth into Blake’s arm. Blood drips to the floor as Casey reacts in horror.