When the Moomin family return from their Season 2 island sojourn, they find their beloved Moominvalley in chaos with the community divided. Only the Moomins’ offbeat approach to life and treasured values of acceptance and kindness can bring harmony back to the valley. The many quirky residents bring unexpected challenges for the Moomins to solve, such as an outlandish reverse heist, a perilous hot air balloon ride and a quest to find the stolen sun. The Moomins face everything life throws at them with curiosity, enthusiasm and great humour.