Thomas Danforth has lived a fortunate life. The son of a wealthy importer, he wandered the globe in his youth, and now, in his twenties, he lives in New York City and runs the family business. It is 1939 and the world is on the brink of war, but his life is untroubled, his future assured. Then, on a snowy evening walk along Gramercy Park, a friend makes a fateful request—and involves Thomas in a dangerous idea that could change the fates of millions. Danforth is to provide access to his secluded Connecticut mansion, where a mysterious woman will receive training in firearms and explosives. Thus begins an international plot carried out by the strange and alluring Anna Klein—a plot that will ensnare Thomas in more ways than one. When it all goes wrong and Anna disappears, his quest across a war-torn world begins …