(4 episodes)

Jasper Thalheim (Matthias Matschke), the insanely clever, quick witted university professor of criminal psychology, advises the police on tricky cases and surprises everyone with his unusual methods of investigation.
Right at the start of the second season, he is asked for help by his ex-lover, Chief of Detectives Christina Fehrmann (Julia Bremermann) in a particularly personal case: the double murder of a couple appears identical to a crime committed 15 years ago.
Might it be that Christina put an innocent person behind bars? To find the real murderer, Professor T. engages in a series of nerve-wracking psychological duels with suspects.