When Bob and Mary hear of a mysterious family legend about a hidden necklace, they are determined to solve the puzzle. But their older cousin Ralph is not all that he appears to be, and the search for a secret passage takes a frightening turn.
- ISBN10 0753727048
- ISBN13 9780753727041
- Publish Date 1 July 2014 (first published January 2004)
- Publish Status Out of Print
- Out of Print 20 December 2016
- Publish Country GB
- Publisher Octopus Publishing Group
- Imprint Pyramid
- Format Hardcover
- Pages 272
- Language English