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It's never entirely clear just whose reality is real in this children's fantasy drama. However, the story goes like this: Two children are staying in an abandoned house with an unusual woman going simply by the name of "Mademoiselle." One evening she brings to the supper table a baked custard dish known as "floating island," and before you can say "Bob's your uncle," they are all transported to a motorized floating island in a world filled with marvelous things. When the island they land on founders, they are forced to try and make do, and along the way they encounter a rich assortment of eccentrics and misfits.