A brutal murder alarms the police authorities. With the investigation leading to confusing controversies, the eccentric professor of criminology Dimitris Lainis is asked to shed some light on the mystery.

The number of victims keeps rising, leading to more questions and confusion. While the police interrogations go on, Dimitris Lainis is looking for clues in the most unlikely source: The Feats of Theseus.

While the police investigations continue, Dimitris Lainis examines the details of Theseus' Feats in his attempt to decipher the enigma. Developments, however, surpass him. One more feat gets 'checkmarked'.

The police authorities 'return' to the first crime scene, looking for new clues. In the meantime, Barasopoulos decides to engage Christina in the case, so they can both benefit from their collaboration.

While the investigations continue, Barasopoulos and Christina agree on the usefulness of an urgent news bulletin. Their aim is to upset the elusive perpetrator and lead him to a revealing mistake.

New leads draw Dimitris and Barasopoulos ever closer to the elusive culprit and lead them to an alarming conclusion. Will they be able to predict the perpetrator's dramatic next move before it's too late?

In the dramatic last episode, the police authorities race against time to locate the perpetrator and put an end to his killing spree. Will they succeed in solving the mystery and finally closing the case?