The Divide

Explosions tear through New York as residents descend into the building's basement, racing for shelter. The group of eight—Eva, Sam, Josh, Adrien, Bobby, Marilyn, Wendi, and Delvin—make it inside just as the superintendent Mickey seals the door. Inside, the shelter becomes their only refuge from the chaos above.

Mickey asserts dominance over the cramped shelter, enforcing rules and allocating scarce resources. The others adapt to the claustrophobic space while tension grows between him and several residents. The mood shifts from panic to a brittle, controlled routine.

The shelter's door is broken open as men in biohazard suits invade, attacking the group and seizing Wendi. Delvin and Mickey manage to kill three of the intruders and Mickey seizes a rifle. Josh volunteers to wear a dead soldier's suit and venture outside to search for Wendi.

Outside the shelter, Josh discovers a sealed area of plastic-tunneled tunnels leading to a laboratory. He finds unconscious children, including Wendi, in stasis pods with shaved heads and bandaged eyes. A soldier tears out Josh's breathing apparatus, forcing him to flee back toward the shelter while he kills two more soldiers on the way.

Back inside, the soldiers weld the shelter door from the outside, trapping everyone. Time passes as radiation sickness begins to take hold; Josh confesses that his outside trip was motivated by a desire to rescue Adrien and himself. Eva's relationship with Sam strains, while Adrien's presence grows closer in her life.

As supplies dwindle, Eva grows closer to Adrien despite her fractured relationship with Sam. Marilyn begins a sexual affair with Bobby, while Delvin grows suspicious that Mickey is hoarding resources inside the shelter's hidden spaces. The group edges toward open conflict.

Delvin discovers Mickey's locked safe room and threatens to expose it. Mickey shoots Delvin in the head, ending the dispute, and the rest of the group refuses to accept Mickey's claim of self-defense. The shelter's power structure becomes even more unstable.

Josh and Bobby harass Mickey in a bid to obtain the code to the safe room, while Eva resists the encroaching violence. In a bid to stop Josh, Eva drops the rifle into the toilet and halts his momentum, intensifying the power struggle within the group.

Josh and Bobby, both losing their hair from radiation, push toward dominance; Adrien helps Eva fend off Josh's attempted rape, but the tension continues to fester. Marilyn's death-tinged entanglements add to the despair as the group's moral compass frays.

Amid the chaos, Sam retrieves the hidden gun and becomes the target of competing demands from Josh, Eva, and Adrien. In a moment of jealousy or desperation, Sam shoots Adrien, triggering a brutal reaction from Josh and the others as fear, anger, and betrayal surge through the shelter.

Josh viciously beats Sam in retaliation, and Eva kills Bobby by slitting his throat. Mickey breaks free and shoots Josh, extinguishing one more threat. The shelter erupts into chaos as the remaining survivors fight for control and survival.

With violence spiraling, Eva frees Mickey and Sam as the shelter catches fire. She discovers a path through the septic system and, after retrieving a biohazard suit, locks herself in the safe room while Mickey and Sam stay behind as the shelter burns.

Breaking through the toilet into the septic tank, Eva drops into the underground and climbs to the street. She emerges into the ruins of the city, staring blankly at the total devastation as the ending leaves interpretation open about what comes next.