American superagent David Spaulding is suddenly uprooted from World War II's European theater to help complete a mysterious transaction in Buenos Aires-- a city of assassins, erotic electricity, and masters of double cross. The potential payoff is immense: a technology that could bring the war to a swift and explosive finish and save millions of Allied lives. But quickly the game changes, truths darken, hidden secrets emerge. And suddenly Spaulding is the man in between, the man furiously struggling for his sanity, the women he loves, and his very life ... the only man who can save the world from the horrible truth of The Rhinemann Exchange.