In the turbulent backdrop of post-war Belfast, a disaffected and haunted Vietnam War veteran named Cain wanders aimlessly as he grapples with the horrors of his past. Finding himself adrift and alienated in the unfamiliar city, Cain is beset by internal demons and a sense of dislocation. As the pervasive tension of the city seeps into him, he becomes increasingly distanced from reality. His interactions with the residents reveal his inability to reintegrate into society, and his psychological state begins to deteriorate further under the weight of his trauma.

Amidst this spiraling mental collapse, Cain stumbles upon a group of young nurses living together in a shared house. They become unwitting targets for his growing disconnect and emerging violent tendencies. As darkness befalls, his fragile grip on sanity shatters, catapulting him into a nightmarish frenzy that threatens their safety. Flashbacks to his experiences in Vietnam intermingle with his present hallucinations, blurring the line between past and present. The film's tense atmosphere builds as the narrative unfurls, laying bare the devastating effects of war on a fractured mind. The ensuing events unfold with unnerving intensity, leading to a chilling crescendo that underscores themes of isolation and the catastrophic aftermath of conflict-driven trauma.