He is from an unnamed city in twentieth-century England, where he witnesses Them playing with his world. He is caught and tossed out onto [the Bounds]?, where he later meets Helen and Joris. The three of them plan to overcome the evil Them.
Jamie is the narrator of the book. He likes to play soccer and takes the role Helen gives him as 'native guide' very seriously. He is ordinary looking - at one point describes his own appearance as "dead common."