This book is about Chat Noir in love with Marinette but can't tell her his feelings. Just when Chat has the guts to tell her, Marinette and her family are leaving to a bigger business in America. Chat can only think of the times he had with his Princess. As Marinette is in America with her family, Chat realizes that Marinette is his life and must tell her his feelings. So Chat being Chat, he decided he is going on a trip to America!