When the Moomin family members need a change of scenery, they decide to take up residence in a lighthouse. Leave Moominvalley? Is it possible? Yes, even the Moomin family need a change of scenery sometimes, so they're off to live in a lighthouse on a tiny island.

Here they find space to grow, and to do things they couldn't in their comfortable, cluttered valley home. As they discover their new home, the family also discover surprising, and wonderfully funny, new things about themselves.