The main character is police psychologist Vince Flemming, who uses his skills to help solve difficult criminal cases in Berlin.

He supports his ex-wife Ann Gittel, who works for the LKA 1.

In season 1, LKA 1 was headed by Dr. Karl Leo, the director of criminal investigations, and as of season 2, by Walli Hoven, the director of criminal investigations.

With Walli Hoven, the secretary Mette Jumarowski, who initially does not get along with Flemming, also joins the team.

With the beginning of season 3, the investigation team is supplemented by the police photographer Robert Anda.