Derrick - Season 4 (1977)

A pensioner who lives in a facility is found shot to death on the premises. But who shot him? Derrick smells foul play because it seems that the house staff have something to hide.

Who killed a greedy loan shark? Derrick begins from the new widow, who doesn't seem to be worried at all.

Mr. Horre hears his wife's last cries of help on the phone. Derrick finds plenty of clues, but which one gets him on the right track?

A young man is found shot in an express train carriage. his identity is revealed quickly, as Derrick knows him already.

An orchestra returns from a successful tour in Asia. At the airport, a curious duo is already waiting for the cellist Jakob Renz.

Achim is planning to earn some extra change washing cars. After offering his services to a few people, one agrees. A dead man lies in the trunk of the car, and Derrick finds an interesting revolver at the scene.

A young girl's body is found in a forest. Soon it turns out that she is an English exchange student who used to ride her bicycle alone, seeking for German company to chat with.