Jimi, a computer game designer, finds that his latest product has been infected by a virus which has given consciousness to the main character of the game, Solo. Tormented by the memory of his fled girlfriend Lisa and begged by Solo to end its useless "life", Jimi begins a search for people who can help him both to discover what happened to Lisa and to delete his game before it is released.

Maria, a provincial Polish girl, travels to Milan to pay her older sister Eva a surprise visit. The sisters haven't seen each other in seven years and Eva has changed a lot. She lives in a luxurious apartment and dresses in designer clothes. Although she pretends to be an interpreter, Eva is actually a call-girl and, one night, fails to return from an appointment. Maria enquires at the hotel where Eva last worked. Eva's body is soon found. The investigation is conducted by Inspector Messina, a trendy cop. Maria and Messina become an inseparable investigating team. Maria poses as a call-girl in order to reveal her sister's killer and they use mobile phones to keep in touch.