In search of adventures, the Moomins, Snorkmaiden and Little My set sail for the French Riviera. After a perilous journey, they reach their dream destination where Snorkmaiden is dazzled by the attentions of a playboy leaving Moomin consumed by jealousy. When Moominpappa befriends an aristocrat and adopts the name 'de Moomin', an exasperated Moominmamma retreats to the calm of their trusty old boat, to wait for her family to come to their senses and to remember their motto: "Live in peace, plant potatoes and dream."