Daria Giraldi is a skilled poker player. Convicted of fraud and gambling, she must serve her sentence in social services. During a work shift at the airport she has a chance encounter, which strikes her. Closely followed by her brother Davide who is also her lawyer, Daria is marked closely by her supervisor, Major Napoli who recruits her into the Secret Services as an undercover agent to capture a dangerous exponent of an international criminal cartel. Ettore tests Daria to probe her cold blood and is amazed by her promptness and wit.

While Monti's murder places Gemini at the center of the investigation, Daria faces Longardi's interrogation. Meanwhile, his interest in Ettore is veiled by the suspicion of being only a pawn of the Services. An evening at a chamber concert becomes the theater of revelation. After an escape and a clandestine journey, Daria and Gemini infiltrate a night club to steal a secret archive that could dismantle a criminal organization.