Nathaniel and Marc have a plan for Marinette to declare her feelings to Adrien. They set it up at school, where Adrien is free of his father's control. But Chloé films their meeting and threatens to reveal everything to Gabriel, who would forbid Adrien to go back to school. Chloé will spend the evening at Gabriel's, where Marinette cannot enter. But Nath and Marc's imagination is limitless, and Marinette, disguised as waitress, sneaks into the Agreste home... where a supervillain is also crashing the party. Will Ladybug save the soirée?