Tiina hides her anger to be an exemplary mother to her child Amanda. The atmosphere of their mother-daughter family vacation is getting tense, as pre-teenaged Amanda is growing out of the cramped caravan and childish games. In addition to her feelings, Tiina also has to suppress unexplainable fires in the campsite.

A beautiful summer day in Moomin Valley. Suddenly, a wasp stings Moomintroll, who falls ill and has to stay in bed. To cheer him up, Moominpappa recounts his youthful adventures; his misunderstood childhood, escape from an orphanage and his historic meeting with the inventor Hodgkins.