All the Moomins want to do is sleep through the long, harsh winter,
but nothing goes according to plan when several unexpected and unwanted
guests show up!
As the Moomins prepare to hibernate through what is going to be the
worst winter yet, several unwelcomed guests take advantage of the
Moomins' generosity and keep the family awake throughout the long
winter. Their quirky but needy guests prevent the Moomins from
hibernating and the chaos only increases with the arrival of a little
nibling determined to find out everyone's secrets. One by one, the
nibling sees what the Moomins and each of their houseguests do when no
one else is looking. But everyone is ashamed of what the nibling has
seen and is determined to keep their secret activities, well, a secret!