Loner Mark Lewis works at a film studio during the day and, at night, takes racy photographs of women. Also he's making a documentary on fear, which involves recording the reactions of victims as he murders them. He befriends Helen, the daughter of the family living in the apartment below his, and he tells her vaguely about the movie he is making.

During a bank robbery, the manager and a cashier are locked in the strongroom, while the crooks escape. Later, when the gang realise that their plan to release the pair has gone wrong, they return to the bank to try and release them before the police turn up.