During their investigation into a toxic waste scandal, Yousseff and Anne Marie Fuchs' client are found dead, and the two detectives find themselves in a life-threatening situation.

Mid-fifties Anne Marie Fuchs lives modestly and withdrawn in Düsseldorf. When a murder happens, it becomes clear that the inconspicuous lady, who is always in short supply, seems to be an absolute investigator with a razor-sharp mind. No wonder, because Anne Marie Fuchs is a former East German spy, especially one who still has a bill from her active time open.

Anne Marie Fuchs investigates for the first time on behalf of the Federal Office for the Protection of the Constitution. Together with her fellow detective Youssef El Kilali , the experienced team sets out to solve two murders. But can they also stop the espionage attack on the Federal Office for the Protection of the Constitution?

Anne Marie Fuchs' ex-husband Konrad Gelden was shot dead in his villa. This shatters the private detective's hope of solving the riddle of the disappearance of her son Florian. Almost thirty years ago, he was kidnapped as a boy to punish Anne for leaving the Stasi. When Anne's business partner Youssef receives a new order, the tide turns.