"Spook-trains in the dead of night! They seem to vanish into thin air -- where do they go? The Famous Five follow the tracks -- and discover a very unusual, underground destination!"--P. [4] of cover.
Mystery Moor isn't called by that name for nothing - as the Five are about to discover! There's something dangerous out there, and the gang mean to find out what it is, but they need some help. The travellers camped on the moor are no use - in fact, they're downright unfriendly. So the Famous Five have ...
