A tranquil day in the Moomin Valley is interrupted by a volcanic eruption and its ensuing flood. Luckily the Moomin family finds refuge in a floating theatre house. To pass the time as the water subsides, the Moomins put on a play. In a series of misadventures, the Moomins get separated. They all have to make it back safely through the dangerous land and still arrive in time for their theatrical
