Professor T investigates a seemingly perfect murder.

Daniel's fiance's boss is murdered, but Professor T is indisposed.

Professor T investigates when a nuclear physics student collapses dead in his office.

Professor T attempts to solve the case of a murdered Neo-Nazi.

Professor T returns to Cologne to help Daniel track down a killer.

Professor T's latest case coincides with his wish to resume a normal life.

Professor T investigates a gossip columnist's murder.

Professor T attempts to solve a crime close to home.