A series of ritual murders shakes Hamburg. First a songwriter is stabbed and scalped, then a scientist. Investigations by Kriminalhauptkommissar Jan Fabel lead into the left student scene of the 1980s. Both victims belonged to the environment of the terrorist Franz Mühlhaus, who was shot during a police operation. His followers could then start a new life. It quickly becomes clear: the key to the current murders lies in the case at the time.