The end of the school year is near, and rebellion is brewing. Monarch has neither the time nor the choice: he decides to implement a plan that is dangerous for his secret identity, and extremely dangerous for Ladybug and Cat Noir, too. Without knowing it, the villain will get help from Lila, who is controlling a meaner-than-ever Chloe behind the scenes. As for Marinette, she doesn't know that Adrien does not dare to tell her a dreadful secret that could jeopardize their relationship forever.