The Moomins embark on a journey to the Riviera, facing storms and desert island dangers, but their trip takes a surprising turn when Snorkmaiden falls for a charming playboy, and Moomin learns a painful lesson about jealousy. Meanwhile, Moominpappa befriends an aristocrat, adopting the name "de Moomin", causing Moominmamma to retreat to their boat, threatening the unity of the Moomins.

Moomins on the Riviera
In this Moomins' Riviera adventure, a treacherous storm and desert island dangers ensue, as Snorkmaiden becomes embroiled in a romantic escapade with a charming playboy, prompting Moomin to grapple with the painful pangs of jealousy.