The New York Times bestselling author of Dark Invasion and The Last Goodnight once again illuminates the lives of little-known individuals who played a significant role in America's history as he chronicles the incredible true story of a critical, recently declassified counterintelligence mission and two remarkable agents whose story has been called "the greatest secret of the Cold War."� In 1946, genius linguist and codebreaker Meredith Gardner discovered that the KGB was running an extensive network of strategically placed spies inside the United States, whose goal was to infiltrate American intelligence and steal the nation's military and atomic secrets. Over the course of the next decade, he and young FBI supervisor Bob Lampshere worked together on Venona, a top-secret mission to uncover the Soviet agents and protect the Holy Grail of Cold War espionage—the atomic bomb.Opposites in nearly every way, Lampshere and Gardner relentlessly followed a trail of clues that helped them identify and take down these Reds one by one, including Julius and Ethel Rosenberg. But at the center of this spy ring, seemingly beyond the American agents' grasp, was the mysterious master spy who pulled the strings of the KGB's extensive campaign, dubbed Operation Enormoz by Russian Intelligence headquarters. Lampshere and Gardner began to suspect that a mole buried deep in the American intelligence community was feeding Moscow Center information on Venona. They raced to unmask the traitor and prev