Grosset and Dunlap. Copyright 1928. Print run Carpentieri-coded 1945A-29. Cover art by Walter S. Rogers. Author was Leslie McFarlane, using the Stratemeyer "Dixon" house pseudonym. #6 in the series. Brown book in very good condition with orange Gretta endpapers, with some patches of mild discoloration at the front and rear bottom and along the spine. Plain line frontispiece with upper corner torn off, but does not interfere with frontispiece art. Original 23 chapters. No internal book titles list. Tanned but not brittle war-time paper (in effect through 1948). No writing. Sturdy binding and hinges without tracking. Excellent corners. Post-text pages list to Hardy Boys Short-Wave Mystery and 15 air combat titles. Yellow spine and "The Hardy Boys" supra-title in script lettering. Very nice dust jacket with some surface abrasion but wonderful color retention. There's a little bit of wear around the edges. "PCJ" and "110-150" on front flap. Front flap last title is The Melted Coins. Rear flap lists Lone Ranger titles to Rides Again. Rear of jacket lists 26 aviation titles. Book is now protected in removable mylar covering. (RHB-6)