She used to work for the United States government, but very few people ever knew that. An expert in her field, she was one of the darkest secrets of an agency so clandestine it doesn't even have a name. And when they decided she was a liability, they came for her without warning. Now, she rarely stays in the same place or uses the same name for long. They've killed the only person she trusted, but something she knows still poses a threat. When her...

Portugal, 1944. Recruited by British intelligence to help uncover Nazi secrets of atomic warfare, math prodigy Andrea Aspinall soon disappears into the crowds of Lisbon, hiding behind a new identity. Karl Voss, an attaché for German intelligence, arrives in the city under the purported agenda of helping the Reich, all the while secretly working to save his beloved home country from annihilation under their reign. Two lost souls meet in a city filled...