Chief Malatesta's criminal investigation unit includes Sebastian, a young police officer, and Melani, a ten-year veteran. Melani is married to Electra, an expert in money laundering investigations. Cantore, a computer whiz, and Irene, an anatomical pathologist, round out the team. They are all pleased to see Commissioner Lazzaro again, back from a mission in South America. They settle into their new quarters in a villa far from headquarters. Sebastian appreciates Lazzaro's help in a serial killer case that has traumatized all of Italy. Five victims have already been identified. Malatesta, who believes Lazzaro is taking too many risks, assigns him Simone Colli, a police officer with whom Lazzaro had a close relationship in the past...