Léna, through her knowledge of social networks, allows Commissioner Ruffin's team to save a new victim in extremis. After new exchanges with the killer, she begins to understand the treasure hunt set up to discover the place and day of his next crime.

Léna puts herself in more and more danger by interacting with the killer. He threatens her loved ones, plays on her nerves. The situation turns against her. She becomes a suspect in the eyes of the police... What if the killer wanted to trap her?

A climate of paranoia reigns over the capital, the killer is still on the loose. The investigation is progressing, and serious leads are being studied, but the pressure is increasing and time is running out. Léna is afraid. The killer seems to know everything about her and is directly targeting those close to her. It is now too late to back down...