After a car accident, Michelle wakes up in an underground bunker with little memory of how she got there. Her mind is filled with confusion and fear when she encounters Howard, an enigmatic man who tells her that the outside world has been devastated by a chemical attack. Although grateful for her salvation, Michelle can't shake off her distrust. Howard's strange behavior and his way of controlling the situation make her uneasy.
As the days go by, Michelle begins to interact with another resident of the bunker, Emmett, who seems more understanding and assures her that the situation is much more complicated than what Howard says. While the three of them find themselves trapped in this claustrophobic shelter, tensions rise and hidden truths start to come to light. Michelle is playing a dangerous mental game, trying to uncover whether they are really safe or if Howard poses an even greater threat.
With unexpected twists and a growing atmosphere of paranoia, the situation becomes increasingly oppressive. As her survival instinct kicks in, Michelle must decide whether to trust her companions or risk confronting the terror of the outside world. The struggle for her freedom and life intensifies, culminating in a chilling climax that questions what it truly means to have hope in desperation.