Schimanski and Thanner are confronted with a case that happened a long time ago and that they were unable to solve: in 1978, one of the perpetrators was seriously injured during a bank robbery and was then executed in the bank by the leader of the gang. The perpetrators managed to escape - except for the Pole Zbiginiew Pawlak, who waited next to his dead brother until the police arrived. During the subsequent investigation, Pawlak was unable to say a word. The press then nicknamed him "Moltke", which he kept even during his prison sentence because he remained stubbornly silent.

A pot of half a million marks - donations for workers who want to prevent the closure of their factory by occupying the factory - disappears after a brutal robbery; and shortly afterwards one of them, the union official Broegger, is murdered.

The atmosphere in Duisburg is heated, speculation is spreading. Schimanski knows that the case must be solved as quickly as possible. But now, of all times, his friend and colleague Thanner has left him; he has gone to Bonn, to a branch of the BKA.

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Schimanski's vacation turns into a fight for his life.

Two men break into the Düsseldorf building authority with the help of an employee. When they are surprised by the security guard while taking photos of site plans, they kill him and fake a robbery and murder.

Charlotte has a car accident but doesn't remember it the way her rescuers say it happened.