Frank Baum was a famous author of children's books. He is best noted for his book The Wizard of Oz. Baum used several pen names when writing different series. He used the pen name Edith van Dyke when writing books for adolescent girls. Sky Island is the sequel to The Sea Fairies published in 1911. Trot lives in southern California where she meets a little boy with an umbrella. Button Bright uses his family's magic umbrella to go on adventures. The children want to visit a near by island but end up literally in an island in the sky. The three travelers land on the blue side of Sky Island, which is a grim country ruled by a sadistic tyrant, the Boolooroo of the Blues. They escape through a fog and end up in the pink half of the island. The pink country is a much friendlier and more relaxed place than the blue side, with cheerfully chubby residents.