An eccentric and ambitious literary agent living in Manhattan becomes increasingly disturbed after a bizarre encounter with a woman he believes to be a vampire. After a night of passion with the mysterious figure, he becomes convinced that he is slowly transforming into a vampire himself. The agent's erratic behavior begins to escalate, affecting his daily life and work, where his volatile nature leads him to torment his secretary over mundane matters. His grip on reality begins to slip as he spends more nights wandering the city, avoiding sunlight, and trying to find ways to satisfy what he perceives as an emerging bloodlust.

As his delusions deepen, the once successful agent isolates himself further from those around him, alienating colleagues and friends alike. Inside his increasingly disordered apartment, he indulges in elaborate fantasies about his vampire transformation, confronting his fractured mind's darkness. He becomes obsessed with finding proof that his terrifying transformation is real, pushing the boundaries of both his psyche and society's norms. Desperate for understanding and salvation, he seeks guidance from psychiatrists, but his sessions dissolve into chaotic monologues filled with wild accusations and fevered dreams. In the throes of his madness, he struggles to navigate his personal crisis as dreams intermingle dangerously with reality, leading him into a darker trajectory as he searches for meaning within his unraveling world.