In the film's climax, Trevor sees Ivan take Nicholas, who he appears to have kidnapped, into Trevor's apartment. Fearing the worst, Trevor sneaks inside. Nicholas is nowhere to be seen, and does not respond to Trevor's calls. Trevor confronts Ivan in the bathroom, and asks him what he has done with Nicholas. Ivan tells him "you know he's dead." Trevor struggles with and ultimately kills Ivan, then flings open the shower curtain, expecting to see Nicholas' dead body but the bathtub is empty.

Returning to the scene that opened the movie, Trevor tries to dispose of Ivan's corpse, rolling it in a rug and struggling to cast it into the ocean. But when the rug unravels, there is nothing inside. Ivan, very much alive, is standing on the pier, laughing. Trevor, suddenly home again and staring at himself in the mirror, begins to repeat "I know who you are," in an anguished voice as he realises that he and Ivan are the same person: the driver in a hit-and-run car accident a year ago in which Marie's son Nicholas was killed. After the accident, Trevor fled the scene and disposed of his car. The guilt and shame he managed to push into his subconscious mind about the boy's death have caused his insomnia, drastic weight loss, and hallucinations. Trevor has invented not only Ivan as a manifestation of his responsibility for the accident, but also an imaginary relationship with Marie, the mother of the boy he killed. He turns himself in to the police and at long last falls asleep in a holding cell.