After Professor T (Matthias Matschke) has been brought back to Cologne from his self-chosen exile at a North Sea beach by commissioner Daniel Winter (Helgi Schmid), he seems to be another person.

***SPOILER ALERT*****
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A gossip columnist exposes T as the murderer of his father which brings him an unwanted notoriety. His mother (Hedi Kriegeskotte) completely loses her composure and threatens to sue. Ironically, T finally feels that the truth sets him free and can hardly wait to enjoy this new freedom with Christina (Julia Bremermann). However, there are massive obstacles in the way of their common happiness. Daniel Winter is concentrated on solving the murder of Anneliese Deckert and, with the help of coroner Nina Lehmann (Vanessa Rottenburg) and T’s ingenious ideas, is getting closer to the cold truth. He is helped by Greta Lindbergh (Cornelia Ivancan), the new colleague in the team and Anneliese’s successor. Professor T and the commissioners investigate four thrilling criminal cases between trust and betrayal, love and hatred, which brings all those involved to their personal and emotional limits.