Carlo Monti is a young man who wants to reveal the secret of his mother's mysterious death which occurred in a strange car accident many years ago. He is an illegitimate son of a late film director. Carlo learns where his father's home was and goes there because he thinks his father was involved in the accident. There he meets Emma, a glamorous young woman, who claims to be Carlo's sister. Carlo is attracted by her beauty but he soon realizes that he has got involved in a dangerous and mysterious affair...