K4oS is back. After having hacked the black boxes of the national armament company with Billie at the beginning of the season, he launches his anarchic project on his own: a revolutionary application that will remunerate anyone who commits an act against the political order in place. As a growing wave of players shakes society, Unit 42 must do everything to stop this viral application, and stop K4oS before he disappears for good. A delicate mission for Billie, plagued by contradictory feelings: her need for justice and her attachment to her childhood sweetheart.