Following World War II, the victorious Allies vowed to hunt Nazi war criminals "to the ends of the earth," yet many slipped away to again assume positions of importance. A former Wehrmacht officer and founder of West Germany's foreign intelligence service, Reinhard Gehlen welcomed SS operatives into the fold, but the KGB found his Nazi operatives easy to turn. As the author of The Plots Against Hitler reveals, other Nazi fugitives became freelance arms traffickers, spies, and covert operators, adding a top-secret—yet combustible—ingredient to the Cold War clash between the superpowers.