FOLLOW

Léna, a newcomer to the Paris police, embarks on a dangerous game when she agrees to communicate over social media with an enigmatic serial killer.

Léna's knowledge of social networks proves invaluable for Commissioner Ruffin, while her online exchanges offer more insights into the killer's mind.

As she continues her online interactions, Léna is drawn deeper into dangerous territory with the killer issuing threats and toying with her nerves.

Amid a climate of paranoia with the killer still at large despite the continuing investigation, the pressure is taking a heavy toll on Léna's nerves.

As the commissioner's investigation stalls, suspicion shifts to Léna. The city is put under curfew, and she finds herself hunted on all sides.

The commissioner discovers a new, unexpected lead, while another development leaves Léna feeling sure that the killer will attempt to achieve his aim.