Follow - Season 1

Léna, 28, community manager, has just joined the communications department of the Paris police headquarters, which is looking to modernize its image. Paris is under tension, a serial killer is raging in the capital and is destabilizing the police using social networks.

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...

Commissioner Ruffin's investigation has led to a dead end, and Léna has become the prime suspect. While a curfew is put in place in the capital, the young girl, hunted from all sides, begins her escape. Samir sets out to find her.

Commissioner Ruffin has been taken off the investigation, but she refuses to give up. By cross-referencing her information with that of Léna, she discovers an unexpected new lead. At the same time, Capucine de Warren comes out of her coma. Léna is convinced: the killer is going to try to complete his plan.