The mysterious murder of a female student causes unrest in university circles. With a close suspect, a close associate and friend, Professor Dimitris Lainis hastens to unravel the mystery.

Investigations into the murder have begun. And while the new Deputy Chief is determined to change everything, a mysterious file reaches the hands of the Director of Police Laboratories.

Continuing the search for the murdered student, the police take DNA and fingerprints from the professors and the university staff. The pressure peaks when a new corpse is discovered.

The two victims have one thing in common: a tattoo on Medusa's head. Later, after his visit to the University, Lieutenant Sklavis finds a note with the name of a girl.

Everything shows that the organization continues its activities. And while Christina is doing an interview in prison, the police visit the mother of the murdered student. Is there any new evidence of her death.

A new suitor for the position of the leader of the organization makes his appearance. Meanwhile, police officer Carra continues the investigation, while a creepy video reaches the hands of Velissaratos.

While Lainis learns about the video, journalist Stergiou risks her life again. Meanwhile, the police continue the investigations and the unexpected meeting of two members of the organization brings upset.

All the pieces of the puzzle are in place. All that is missing is the arrest of the culprits and the identification of the Reptile. A voluntary testimony will lead the police to a meeting with him, in the subversive finale.