For generations, the children of Skene Falls, Oregon have befriended the Pixies of the Ten Acre Woods. Eventually the kids grow up and lose their beliefs in the Pixies. However, Dusty Carrick and her brother Dick are the rare exception. When Dusty and Dick's childhood friend Thistle Down appears in a human body, they have no choice but to believe her when she says she is exiled amongst the Pixies. With Thistle comes yet another problem. The antagonists of the novel want to tear down the Ten Acre Forest, which would forever alter the lives of the Pixies, children, and the residents of Skene Falls. It's up to Dusty and her friends to save the forest and help Thistle Down.