For readers of The Nightingale and The Alice Network, a thrilling historical debut about a female scientist working to develop the first atomic bomb during World War II, and a young military investigator determined to uncover her secret past. In 1945, Hannah Weiss, a Jewish-Austrian scientist, is removed from her laboratory at the Los Alamos National Lab and taken to Leavenworth Prison for interrogation. Major Jack Delaney, a rising star in the shadowy world of military intelligence, is convinced that someone in the United States has been sharing information with the Nazi party.

The captivating, raven-haired, female scientist in New Mexico is his primary suspect. Across the globe, researches are racing to perfect the atomic bomb--a weapon powerful enough to stop WWII, and, perhaps, all future wars. But for Hannah, who has been sending mysterious postcards to a contact still in Germany, the trouble is just beginning.

As Jack questions Hannah about her involvement with the infamous Kaiser Wilhelm Institute in B