Doc Savage Double Novel Volume 55

"Doc and Patricia Savage enter an Arctic abyss where dinosaurs and prehistoric humans survive, and race against Japanese agents to uncover the secret of The Time Terror that could change the outcome of the war. Then, a series of crimes committed by 'graduates' of the Man of Bronze's Crime College threaten to destroy Doc's reputation. What is the sinister secret of The Talking Devil? This special collectors edition showcases both color pulp covers by Emery Clarke, Paul Orban's classic interior illustrations and historical commentary by Will Murray, writer of eight Doc Savage novels."