In the luxury Hotel Montíboli, the timid Belgian Maenhouts clash with the boisterous Dutch Emmers. While the Dutch family immediately starts hijacking other guests' sunbeds, the Belgians fall victim to a double booking — and so the chaos begins.

During a night of partying, Marie and Mila fall for Sem and Max. Their summer romance sparks a wave of gossip and misunderstandings. Meanwhile, Hilde poses as a relative of the mystery guest, sending Ludo and the staff into a state of blind panic.