In "Gang of Secrets" Chat takes Ladybug to a movie and she rants and raves about romantic comedies. Instead of Ladybug rushing off to go swimming, Chat manages to stop her in her tracks. And then he makes a proposal she does not want to consider.

Ladybug is dating Chat Noir, but something is wrong. She isn't the same. For that matter, Marinette has not been herself for months. Something happened a few months ago and things are not as expected. Can Adrien figure it out before Hawkmoth destroys the city?