In a world shattered by an unexplained catastrophe, the survivors of a devastating event known simply as "28" must navigate a landscape of paranoia and desperation. The film follows a group of strangers, including a resourceful doctor played by Emily Blunt and a hardened ex-soldier portrayed by Idris Elba, as they seek refuge in a remote bunker. Each character carries the weight of their own personal loss, and their fragile trust is tested when a mysterious signal suggests there may be others still alive. As supplies dwindle and tensions rise, they must confront the haunting question of what truly caused the disaster and whether the outside world holds any hope for redemption. Blending psychological horror with tense survival drama, this atmospheric thriller keeps audiences on edge, exploring the thin line between humanity and monstrosity in the face of the unknown.