In the middle of the day, Frederick Seibold is struck down by four people masked with dog heads on a golf course near Frankfurt. When he comes to in a dark basement hole, the two Frankfurt chief inspectors Anna Janneke and Paul Brix are already entrusted with his case: Frederick's ex-girlfriend, Bille Kerbel, had received a cut finger that she took straight to the police. Konrad Seibold, Frederick's father, a well-to-do business lawyer, does not see the point of paying a ransom, as he believes his son Frederick himself is behind the kidnapping. Janneke and Brix are surprised by Seibold's stubbornness, who also received a finger and did not react. When it turns out that the severed fingers were not from Frederick, the father appears to be right. Via Bille, the trail leads the inspectors to Conny Kaiserling, who runs a studio for women's self-defense courses. Brix comes up with the idea of smuggling Fanny undercover there. Janneke and Brix are called to a woman's corpse in the Taunus. Antonia Wagner, the dead, was apparently pierced by a fence post. In search of outside interference, the coroner finds fragments of Frederick Seibold's skin under her fingernails. Was Antonia involved in the kidnapping?
—ARD Das Erste