Silke Rohwedder's empty sailing boat is found on the open sea. Her jacket, shoes and handbag on board, there are no signs of her.

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A murder without a motive? - Inconceivably. And yet the murder of the 48-year-old senior physician Hermann Johns seems completely unfounded. The renowned physician, who worked in the maternity ward of a Cologne clinic, seems to have been popular with patients and hospital staff alike.

In his 15th case, inspector Fritz Dellwo has to investigate on his own because his colleague Charlotte Sänger is undergoing further training. But Dellwo is ripe for a vacation and decides to take some time off - a forty-year-old detective in midlife crisis. He visits his old love Katrin and subjects his life to a thorough examination. But even in the supposed idyll, crime catches up with him.

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A man is thrown from a bridge and run over by a lorry. Investigations show that he was dead before falling. Cologne DIs Ballauf and Schenk proceed to investigate the neighbourhood where the man had lived. The neighbours have all kinds of relationships: quarrel over a boundary, fathership of another's daughter... but where is a motive for murder?

Long-distance bus driver Beni Gisler sees the man on the bridge, but there is nothing he can do. The body hits the windshield and is thrown away. In his previous life, Gisler was a train driver and was involved in suicides several times. The latest incident therefore brings back traumatic memories.

Inspector Flückiger knows Gisler from his time in the military. Supported by the psychologist responsible for the care team, he takes Gisler under his wing. It soon turns out that the dead man had a high dose of benzodiazepine in his blood. Under these circumstances, it would have been impossible for him to throw himself off the bridge alone. The identity of the possible victim also raises questions. Inspector Flückiger and colleague Liz Ritschard begin to investigate.

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