The Last Hope (Maggie Hope Mystery #11)

"Maggie Hope has come a long way since she was Mr. Churchill's secretary. In the face of tremendous danger, she's learned espionage, sabotage, and reconnaissance. But things are different now that she has so much to lose, including the possibility of a family with John Sterling, the man who's long held her heart. British Intelligence has ordered Maggie to assassinate Werner Heisenberg, the physicist who may deliver a world-ending fission bomb for Germany. She's shaken. An assassination is u...