Marinette's secret is now out to everyone. Everyone including Hawk Moth. Now Hawk Moth is after her, and he will do anything to get ahold of her miraculous. On the other hand Master Fu has introduced a new girl that would be a new superhero soon, and it also turns out that the girl will be going to their school. It's a shocking to Alya, though, because she found out that the new girl, Stephanie has a crush on Nino. New rival! Will Marinette be able to escape Hawk Moth? Will the superheroes be able to save Stephanie before she turns into a supervillain? And will Alya be able to confess her love to Nino before Stephanie beats her to it? * Book One: A Sudden Realization Book Two: A Sudden Situation Book Three: A Sudden Return

Countless numbers of people have stepped inside this building... This building filled with kids that are orphans, but they always say that... No one makes it out... Alya has got a job to babysit some kids that are from this building... Of course she doesn't know that people are scared of this building and the people inside. She asks for help from a few friends of hers, Marinette, Alix, Rose, Mylene, and Juleka. Once they get to the building though... They find it quiet... Too quiet for a lot of kids that are here... So they decide to check out what's going on. Turns out that there is Ladybug who has been controlling the kids to do evil. But that's impossible though... Marinette is with them... So who is this evil Ladybug?