Spring has long since arrived in Moominvalley and Snufkin has returned from his winter trip to the south, but the Moomin family is asleep. All attempts by their friends to wake them up fail. The suspicion arises that something is not right in the Moomin house. Only a spell can make someone sleep so deeply. Indeed, the witch confirms that she has put the family to sleep, and apparently no one can persuade her to lift the spell.