In a cold-blooded attack on an art transport Tereza, the pregnant girlfriend of Commissioner Robert Marthaler, is mortally wounded. Since Marthaler is thus affected by the incident himself, his boss Herrmann denied him the appropriate investigation. However, Marthaler does not let it stop him and continues to investigate on his own. He soon finds out that there seems to be a connection between the current assault and an unexplained prostitute murder more than 30 years ago.

Kommissar Marthaler - Engel des Todes

Three men and a houseboat: Three crisis-plagued Stuttgarters sailed for a week on the Havel in the direction of Müritz. The unfamiliar and not so tranquil Dreisamkeit brings so many things to light, which has hitherto been successfully concealed and repressed. The summer boat trip paves the way to the realization that a turnaround in life could not hurt.