Springtime arrives in Moominvalley, along with a shiny magic top hat that Moomintroll and his friends Snufkin and Sniff discover can turn anything—or anyone—into something else!

It is spring in the valley and the Moomins are ready for adventure! Moomintroll and his friends Snufkin and Sniff find the Hobgoblin's top hat, all shiny and new and just waiting to be taken home. They soon realize that his is no ordinary hat; it can turn anything—or anyone—into something else!