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...