Analyzing the data found at Rosalia's house, Gambera reconstructs the boss's movements up to a clinic in Palermo. The confirmation of his suspicions prompts the colonel to launch a colossal operation involving the GIS (Special Intervention Group) and territorial units. On the morning of January 16, Operation "Sunset" reaches its climax: for Messina Denaro, the moment of truth has arrived.

After the discovery of the mole, the team is demotivated, but the operation continues. The mission on Mount Catalfano, to install an antenna, ends in tragedy due to a violent storm. Gambera and his team then decide to infiltrate the boss's sister's house: within those walls, an unexpected clue changes the course of the investigation.

Gambera entrusts Sancho with the task of monitoring the team to unmask the boss's informant. While his private life falters due to his obsession with the investigation, a massive raid targets Messina Denaro's associates. However, one last obstacle remains: identifying the traitor within the team before it's too late.

Colonel Gambera leads a select team of the ROS (Special Operations Group) to capture mob boss Matteo Messina Denaro. With only three months to complete "Operation Sunset," the group faces a race against time. But amidst setbacks and unexpected escapes, Gambera realizes that a mole is hiding among his men.