Bad Tölz in 1988 - Commissioner Walter Degenhardt (Adnan Erten) is returning from a trip with his lover Patrizia Lehmann (Katharina Abt) when a detonation shakes the air. As the investigation will later show, it is about the explosion of a letter bomb - addressed to the owner of the Pension Freiheit. Degenhardt and his colleague Rio Hartmann (Luky Zappatta) take on the tricky case. But then two officials from the BND suddenly took over the investigation. A little later Patrizia Lehmann is found dead. And Degenhardt is firmly convinced that his lover, with whom he wanted to start a new life because of his desolate marriage, was murdered. Now there is no stopping the two commissioners, who could not be more different. They begin to research on their own and thus track down a gang of people smugglers and the Stasi. With the help of a Franciscan priest and the shrewd policeman Stevie, they just manage to prevent another murder and hunt down the two Stasi agents.