For Jule Zabek (Sophie Pfingstorf) and Karl Hidde (Alexander Held), this is the first corpse that comes with its own date of death - tattooed on the victim's chest. When the forensic scientist realises that there was also a scar in the same place on a previous corpse, indicating that the tattoo had been removed, Jule thinks of a series. But Hidde is sceptical. What did the men have in common? What is the connection between the offences?