Life takes a turn for the fantastic when the enigmatic Dr. Riddles and his puppet-like partner, Kedo the mamodo, pop into town. Armed with an arsenal of baffling tricks and traps, Dr. Riddles forces Kiyo to question the very nature of his knowledge about both Zatch and his book. Do Zatch and Kiyo have enough strength to solve the doc's puzzles and learn a new spell at the same time?