The fitness trainer Mike Helmer has been found dead in the sauna of his club. The door of the sauna has been closed from outside, so it looks like a murder. In the mailbox of his cell phone the police finds a masculine voice sending him menaces. Near the corpse there was an ear ring. The medical examiner Dr. Conradi, who is member of the club tells that Mike Helmer was quite known for his love affairs with female clients. On his notebook the team finds a list of names of women, after a selection two names are interesting, Julia Hagemann and Pia Reuter, both women have a good alibi.
—zutterjp48