One summer afternoon in 1907, Abel and his wife (both mice) are picnicking, when they become separated during a violent rainstorm. After flying some distance, Abel discovers himself alone on a river island, unable to swim due to the powerful current. Abel periodically attempts to leave the island by various means: flying on a leaf, rowing a crudely fashioned boat, etc. Meanwhile, he tries to create a normal life of sorts, even learning to enjoy a new hobby: sculpture. Still, Abel's goal is to escape the island and rejoin his wife in the city.
