Originally published, Grosset & Dunlap, 1938; (B59-15298), Sampson Low, 1959.
OBNB doesn't sell books, but you may be able to find a copy at one of these websites:
The secret warning by Franklin W. Dixon. ISBN 0356024040. Published by Macdonald & Co in 1968. Publication and catalogue information, links to buy online and reader comments.
