Volpina

Adrien discovers a hidden book in his father's safe with information about different Miraculous holders and steals it to learn more. Later, an exchange student named Lila Rossi arrives and claims to be good friends with Ladybug in order to win Adrien. Offended by Lila's lies, Marinette begins to tail her, during which time she watches Lila steal the book from Adrien. Tikki recognizes the cover design and insists upon taking the book for further study. Lila then tells Adrien that she is descended from the Miraculous holder, Volpina, prompting Marinette to transform into Ladybug and call Lila on her lies in front of Adrien. Embarrassed, Lila runs off and allows Hawk Moth to transform her into Volpina, the superhero with the power to create illusions, so she can gain Ladybug and Cat Noir's trust and betray them. The plan fails, though Hawk Moth is not concerned, proclaiming that his big day is at hand. Afterwards, Tikki's suspicions about the book are confirmed: it is the long-lost book of lore that contains coded secrets about the Miraculouses. She then brings Marinette to meet the Great Guardian, Master Wang Fu.