Police Officer Sven Schlüter immediately alerts his colleagues at night when he finds his wife dead in his house. Defensive injuries indicate a hard fight before she died. The investigators find out that the victim had an affair, so her husband Sven and the secret lover Dr. Martin Schmidt get into the focus of the investigation. But then a family drama reveals itself as the mutual son Yannick was terminally ill, which led to a strained relationship within the family.