Lux is playing a double game. He and Charlie are working hand in hand on the STALKER app, unaware that he's actually seeking revenge against her. But Alma tries to reason with him, and Lux may well discover that he was wrong about his nemesis's true motives.

With the help of the Stalker's Hunters, Lux discovers how, and why, Charlie stalked and manipulated him. By retracing the events, he uncovers the true face of his nemesis.

Lux is ready to do anything to bring Herzig down. He proposes a new business deal to Alex, Samir, and Lolo. But when his worst enemy tells him that Charlie and Alma are going to work together, Lux becomes suspicious.

To unravel the mystery surrounding Herzig, Lux can count on Charlie, who is devising a strategy involving Eva Lang, the new ENSI teacher who is very close to the director. Meanwhile, he is forced to resume his stalking to help his friend Oscar, and sees Alma drifting away from him once again.

Lux has lost everything and is even expelled from ENSI for trying to protect Charlie. He finds comfort and help with her. But Alma has returned from Canada, and Charlie identifies a new suspect who could be the White Duke.

While setting a trap for the White Duke with Alma's help and targeting Bilal, her father, Lux discovers more about the behind-the-scenes of the Krypto hack and decides to cover for Charlie.

Lux is once again scrutinizing Alma's every move, while keeping a close eye on Charlie, who has just launched his app designed to hack Krypto, with Alex's help. But Charlie eventually catches him, and the ever-mysterious White Duke fires another shot.

Lux's detractor now has a name: the White Duke. Lux now suspects her friend Zoe, while continuing to keep a close eye on Charlie. Charlie, meanwhile, is getting closer to her sworn enemy, Alex, in preparation for a dubious hack. But the next victim seems to have been chosen: Alma.

To unmask his stalker, Lux does everything he can… He even goes so far as to stalk his main suspect IRL, the only one who a priori has the skill necessary to be able to hack him: Charlie, a new first-year student at ENSI.

As head of the ENSI student union, Lux has never been more popular, and most importantly: he's stopped stalking. But during the association's back-to-school party, a mysterious hacker steals the evening's funds. To defend himself, he has no choice but to relapse into an old addiction… stalking.