"A novel of science, love, espionage, beautiful writing, and a heroine who carves a strong path in the world of men. As far as I'm concerned there is nothing left to want."-Ann Patchett, author of The Dutch House Love. Desire. Betrayal. Her choice could save a nation. Chicago, 1950. Rosalind Porter has always defied expectations-in her work as a physicist on the Manhattan Project, and in her passionate love affair with colleague Thomas Weaver. Five years after the end of both, her guilt over the bomb and her heartbreak over Weaver are intertwined. She has almost resigned herself to a conventional life. Then Weaver gets back in touch-and so does the FBI. Agent Charlie Szydlo wants Roz to spy on Weaver, whom the FBI suspects of passing nuclear secrets to Russia. Despite her better instincts, Roz has