When spring begins in Djupforsen all is not as it should be. There’s no sound of insects buzzing, the birds are not chirping and the flowers are not beginning to bloom!
Mulle and his friends realise that insects have all moved somewhere else! Without them, the plants and animals of Djupforsen will struggle to thrive. Banding together, the villagers help Mulle build the Airship Rummelhumlan from the resources they have around them.
Mulle, Gårdån and Buffa then set off on an exciting flight to tempt the insects back to Djupforsen.
5 kroner of every copy sold is donated to the Swedish Society for Nature Conservation’s work to save bees and other pollinators.