Children find a car in the water where they are swimming. Inside the car is a dead man. Stilton's old colleague and ally, Mette Olsäter, takes the case and quickly starts a murder investigation. The dead man, Nils Wendt, has been missing since 1987. Where has he been all these years, and why has he turned up now? Olivia tries to take it easy after the attack. She is certain that Jackie Berglund is behind it. But she is more worried about her cat, Elvis, who she hasn't seen since. When she watches the news about the dead man in the car she immediately recognises Nils Wendt - the man she saw on the beach in Nordkoster. She contacts Stilton right away. Mette Olsäter goes to see Linn Magnusson, who feigns shock at the news that her old business partner, Nils Wendt, was murdered. Linn doesn't tell her that he recently contacted her, and that they met in person.