Moomintroll employs the services of his new friend, a little ghost, to convince Snork Maiden that he is brave. But when his trick backfires dangerously, Moomintroll is the one who needs saving.

Moomintroll faces his toughest challenge yet when he wakes up too early from hibernation. To survive the perils of deepest winter, he must first find his primal side with the help of a strange, ancient ancestor.