The riddle of the hidden treasure /
Blyton, Enid.
Baverstock, Gillian.
Ludlow, Patricia.
Frankland, David.
Blyton, Enid.Treasure hunters.
London : Bounty books,
2013.
Originally published as: The treasure hunters, 1940.
"Updated and altered to become part of the Riddles series in 1997 by Enid Blyton's daughter, Gillian Baverstock" --T.p. verso.