The adventure continues! Norbert Nipkin and Grog, scolded and scoffed at by their parents who refuse to believe that the pair have become friends, set off alone to find and solve the final mystery of the Magic Riddle Stone. On the way, they meet delightful characters such as Wag and the brothers Numb and Skull, but they also must deal with the Marsh Monster and the evil Grimald. Humour and suspense combine to hold the reader spellbound until the adventure's dramatic conclusion. This new edition features a never-before printed pull-out illustration by the artist called "Hide and Seek", suitable for framing for the bedroom or classroom. 02 02 The adventure continues! Norbert Nipkin and Grog, scolded and scoffed at by their parents who refuse to believe that the pair have become friends, set off alone to find and solve the final mystery of the Magic Riddle Stone. The adventure continues! Norbert Nipkin and Grog, scolded and scoffed at by their parents who refuse to believe that the pair have become friends, set off alone to find and solve the final mystery of the Magic Riddle Stone..