Conflict is rife between Ecopolis activists and the Köhn shipping company. One is concerned about the environment, the other about their competitive power. When the corpse of a ship owner is found at the fish market, Inspector Sebastian Fink starts investigating. The case leads him to a bitter manager in a modern glass palace high above the docks, a sport-obsessed widow in the country and a student couple in St. Pauli. Sebastian already was busy with the case – then his grandmother turns up on his doorstep one morning and confronts him with a long-hidden family secret.