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Berlin physicist Anton Breker struggles to subvert Nazi atomic bomb research by passing worthless scraps of technical information to the Nazis to maintain his privileged travel status, while he is actually a British double agent. After Nazi informers threaten Austrian physicist Lise Meitner, he works with his close friend, Klaus Duisberg, to mastermind her escape. Equally deceptive in affairs of the heart, Breker ends the latest in a long string of sexual escapades, this one with the young gymnast Clara Fischer, to begin planning his greatest challenge, the seduction of Duisberg's dangerously attractive but bored wife Teresia. Breker is surprised when nuclear chemist Otto Hahn, Meitner's thirty-year partner in research, rings his doorbell claiming the unbelievable, that atoms of uranium split apart to form different elements. With Germany far ahead of the rest of the world in atomic bomb research, Breker realizes that he must try to slow their progress by steering Heisenberg's thinking down blind alleys. As Duisberg threatens to turn his friend over to the Gestapo for his ultimate betrayal, Breker faces his greatest challenge, keeping Heisenberg from revealing the most dangerous nuclear secret of the war to the Nazi hierarchy.

Christopher Jenson just wants to write the great American novel, but he suffers from an infernal case of writer's block. To make ends meet, he offers loss prevention services as Christina Jenner or Christopher Jenson, depending upon the needs of his clients. As Christina, he assists cheapskate Franklin Benton to unravel a host of mysterious activities in his family business. Desperate for income, he agrees as Christopher to prove Miriam Smithers' suspicions that her husband, Bob, was murdered. Her shady behavior makes her the prime suspect, particularly when she discloses that she will receive a massive insurance payout if Bob was murdered. Will Christopher/Christina be Miriam's next victim if she is the killer? His investigations overlap as he scrambles to keep Christina's identity separate from Christopher's persona. He might need both identities to save him from a relentless killer.