While Athena becomes the new Head of Homicide and Dimitris mourns the loss of his beloved Tonia, a deadly explosion forces the Department to regroup and take action.

The crisis in Apostolos's relationship with Eleni escalates. At the same time, while the police interrogate those involved in the explosion, the appearance of people from the past complicates things even more.

Danae is visiting Laini, who has now returned to his teaching duties and reveals her plans in relation to the "other me" case. Athena solves the case of 18 -year -old Melina. Masatos is in the hospital after Vanorta's attack. At the same time, a second case of homicide occurs, while the police are dealing with the explosion in the funeral home.

While Tonya's father demands answers, Christina accepts a proposal from Danae. At the same time, the police investigation into the explosion and the identification of Staikos has reached an impasse.

Forensic results turn everything upside down in the explosion case, leading to yet another impasse. Faced with new information, the police implement a plan to shake things up.

An unlikely alliance is born as the police's plan fails, forcing Laini to become involved in the investigation. Meanwhile, the authorities are informed of another murder.

The police finally achieve a major breakthrough in their investigation, thanks to the help of not only Dimitris Lainis but also some unexpected allies.

Professor Dimitris Lainis puts all the pieces of the puzzle together, while the police receive an unexpected proposal that causes moral dilemmas. Everyone is held accountable for their actions and punishment meets justice. "Nemesis" is coming for everyone.