A young woman is shot in the face through the peephole, an identification seems hardly possible. But it's not the flat owner who has been shot. And professor T returns to Cologne, to help Daniel find the killer of Anneliese Deckert.

A garbageman finds a dead woman in the truck after his round thru Cologne. Valuables and ID are still on the wealthy woman. Anna's murderer? T wants a normal life and starts dating Christina again.

A gossip columnist is killed. The list of suspects is long and includes a soccer star and Professor T. Anneliese's murder is still investigated.

It appears that Christina's been shot by someone she knew and trusted. Professor T. tries to solve the crime while Daniel and Greta investigate.