Originally published: New York : Grosset and Dunlap, 1936 ; London : Sampson Low, Marston, 1959.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The sinister signpost by Franklin W. Dixon. ISBN 0006910505. Published by Armada Books in 1975. Publication and catalogue information, links to buy online and reader comments.
