After five years away in Africa, young engineer Bob Schneider comes back to his hometown for a short time.He wants to find again Andrée ,a girl he used to be in love with.He meets Karin ,who lives in the same boarding-home as Andrée.Since Bob 's departure, Andrée has been prey to Korbanke , a pimp and a drug trafficker :she has a child whose father is none other than Bob.Korbanke mistakes Andrée's former lover for a policeman ,and lures him into a trap.