Retired Chief Inspector Robert Anders becomes the focus of a murder investigation after returning from Gotland to his old home on Lake Constance. The body of fifteen-year-old Lea Cordes is found floating in the lake. Robert was the last person to see her alive, making him an obvious target for the police. The victim’s ex-boyfriend, Dennis Felber, is suspected of murder, but Anders’s search for the killer breaks away from the classic investigation conducted by the police and ultimately leads in a completely different direction.