Derrick

Walter König (Schnitzer), the owner of an Italian restaurant, receives demands for protection money, but refuses to pay. Mafia thug Johannes Dohna (Kohlund) is sent to give König a final warning, but in an altercation ends up killing him. He flees, and leaves his daughter Vera (Scholze) behind. When Derrick arrives at the suspect's apartment, he finds Vera there, and realizes she is the key to catching the murderer.

During a burglary, the owner of the apartment comes home unexpectedly, and is murdered. The cleaner, Anna Lakowski (Weis), arrives, and sees the face of one of the burglars as they flee. Undercover policeman Jakob Droste (Franckh) gets a lead on the murderers, and Lakowski is needed to identify the man she saw. Soon, however, it becomes clear that her infatuation for Derrick will be an impediment to the investigation.

Herr Kordes (Hamel) risks losing his house if he cannot produce one millionmarksin ten days. He comes up with the plan of kidnapping the daughter of successful businessman Herr Heimeran (Herz-Kestranek). Heimeran decides to involve Derrick. The police set up a trap at the money transfer, but things do not go according to plan.

A hobby ornithologist, recording bird sounds, happens to record the sound of a girl being murdered. Derrick meets with the brother and sister of the deceased, Paul (Schücke) and Gabriele (Fink), and senses that they are hiding something. Shortly after, their mother (Sutter) arrives in town, and Derrick enlists her help to reveal the truth.