A man of Karow’s age is found dead in a wooded area. He was shot in the head. Karow knows the dead man, Maik Balthasar (Andreas Pietschmann), from his youth. Contrary to the opinion of the commissioner in charge, he rules out suicide and discovers that the dead man was an undercover investigator. Maik worked for Mesut Günes (Sahin Eryilmaz), a well-known Berlin nightclub owner involved in numerous violent crimes, which, however, could never be clearly proven against him. Günes fingerprints are found on the murder weapon. Prosecutor Sara Taghavi (Jasmin Tabatabai) finally sees her chance to bring Günes to justice. However, he denies the murder.

To the prosecutor’s annoyance, Karow is not satisfied with such obvious circumstantial evidence. Although she tells him to stay out of it, the inconsistencies in the case don’t give him a moment’s peace. To find out what really happened, he takes a vacation, moves undercover into Maik’s apartment and follows in his footsteps. Camilla (Kim Riedle), who works in Günes club and knew Maik well, becomes his ally. More and more he slips into the role of the dead man and in the process also delves deeper and deeper into his own past.