Out for a walk in London one day, Gip and his father happen upon a magic shop. At Gip's urging, the two go in — and things grow more and more curious by the minute. Counters, store fixtures, and mirrors seem to move around the room, and the shopkeeper is most mysterious of all. Gip is thrilled by all he sees, and his father is at first amused, but when things become stranger and sinister father is no longer sure where reality ends and illusion begins.