Norbert Nipkin and Grog, scolded and scoffed at by their parents who refuse to believe that the pair have become friends, set off to find and solve the final mystery of the Magic Riddle Stone. On the way, they meet characters such as Wag and the brothers Numb and Skull, but they also must deal with the Marsh Monster and the evil Grimald.
- Limba : Engleza
- Data Publicarii : 01 Aug 2004
- Editie : Abridged ed
- Format : Audio cassette
- ISBN : 9780929141251