A mysterious and strange looking man has moved into an abandoned house on Hardscrabble Street, and the whole town is curious.
Gail, Jerry and Nancy meet their new neighbor, Dr. Fell, as he is moving in. They notice right away that there is something slightly strange about this man.
Dr. Fell immediately builds a magnificent playground as a gift to the children in the neighborhood. It is like nothing the children have ever seen! Every child in town wants to play on it, even when they are supposed to be in school!