If you haven_t met a Moomin yet, you_re missing the most magical fun . . .
Moominpappa is looking through his old Discovery Collection and finds a special shell, which holds the Ocean_s Song. Moomintroll and his friends want their own magical shells, so they sail off in search of treasure. But as they reach the island of the Hattifatteners a thunderstorm strikes. Will the friends find the Ocean's Song in time?