The Phantom Tollbooth (Collins Modern Classics)

One day Milo finds an enormous and mysterious package in his room. A phantom tollbooth, with a map to a weird world beyond! So Milo sets off on a fantastic voyage in which he meets: the not so wicked Which, Faintly Macabre, Alec Bings who sees through things, and the watchdog, Tock, who ticks.