At midnight, on a deserted Athenian street, a beautiful woman named Eleni Chalkia is fatally stabbed by a stranger, who immediately disappears into the shadows. The murderer is Ioannis Zachos (Manos Logiadis), a young man lacking in both mental and sexual stability, who lives out his erotic fantasies through purifying violence. He often fantasizes about killing beautiful women, in this way compensating for his deficient manhood and satisfying his passion for power. When he is arrested, he immediately confesses his crimes, which is a relief to the police, who have been accused of gross ineptitude by the press. During the trial that follows, the relentless question, “who is ultimately guilty? Man or society?” is again raised. Ioannis Zachos is not sentenced to time in prison because of his disturbed personality, but instead must spend the rest of his life in an institution for the criminally insane.