On her thirtieth birthday, Commissioner Giulia Corsi finds herself facing yet another difficult case: three criminals with criminal records for armed robbery are preparing a big heist. The traffic police will discover them during a routine check, in which two police officers will be killed. The intervention of the charming Commissioner Turchi, who has been on the trail of the three criminals for some time, is crucial to the investigation. Just recovered from the serious wound inflicted by Turchi, Giulia returns to the X Tuscolano. Mauro and Roberto are investigating an unidentified young woman who was hit the night before and kept in a pharmacological coma. They find her car and from there they discover that Flavia is the wife of a well-known jewelry designer, Guido Palmeri. Once in his atelier they find themselves in front of the artist's body, killed by a stab to the heart.