184 pages
English language
Published March 30, 1967 by Hodder and Stoughton.
3 stars
(1 review)
Spook trains in the dead of night! And they seem to vanish into thin air -- but where do they go? The Famous Five are on to it! But discovery of an unusual underground tunnel system, and a secret train-service, has them puzzled. If they follow the tracks, will they solve the mystery?
