Doc Savage New Adventure Softcover Volume 11 Secret Of Satans Spine

"East of Nassau lies a strange spit of volcanic rock - a treacherous reef cast up from the bottom of the sea. Why does a beautiful blonde try to lure Monk Mayfair from boarding a steamship bound for that unknown place? Who is the sinister sailor known as Diamond? What is his objective? The incredible answer is found in a remote reach of the Caribbean Sea, and the mysterious thing that men whisper about, and die to possess - the starling secret of Satan's Spine!"