Copyright 1951, first edition, in original brown covered boards with Hardy Boys silhouette in dark brown and dark brown lettering on front and spine. Very light rubbing to edges. Corners lightly bumped. Maintains original wrap dust jacket with Hardy Boys in circle on spine. Inside front flap lists Hardy Boys Mystery Stories through this title. Back flap lists Ken Holt Mystery stories through "The Clue of the Marked Claw" and back dust jacket lists Rick Brant stories through "The Phantom Shark". Dust jacket is in good condition with some edge wear and paper loss. Orange decorated endpapers by Gretta. Includes a plain frontispiece. Original text with 25 chapters. Binding is tight and pages are clean with dark blue top page edges. Remnants of a bookplate on front endpaper. Comes from a smoke free home.