The Rocketeer: In the Den of Thieves (The Rocketeer: In the Den of Thieves #3)

Cliff and Betty, with the aid of the jet pack's mysterious inventor, are smuggled into Berlin on a desperate attempt to rescue Peevy and try to stop the Nazis from creating a fleet of flying doppelgangers for the German Luftwaffe! But even with the repaired rocket at his disposal, can Cliff overcome Hitler's war machine and the SS Rocketeer prototype and save Peevy and Betty?!