Una lettera all'alba (1948)

Carlo Marini is a cocaine trafficker. While at the bedside of Anna, a former lover who is dying, Carlo learns that he is the father of Mario, a young man and - incidentally - a coke dealer like him. Mario lives under the influence of his mate Renata, a girl who is greedy for luxury. Not knowing that Carlo is his father and that he is trying to help him, the young man takes part in a burglary at a countess's. The old woman, also a drug supplier , is found murdered and everything points Mario's guilt. Carlo decides to investigate...