Within hours of finding a Nazi WWII codebook in her father's attic, librarian Sara Fischer becomes a target. Afraid for her life, and chilled by memories that have nothing to do with her quiet, staid life, Sara calls in a debt. FBI agent Marc Bayard moves in the shadowy world that Sara has fallen into and may be the only one who can guide her out.

In a race to reveal the secrets of a Nazi code, Sara and Bayard are catapulted into the cutthroat world of international intrigue and oil politics. Sara wants to believe she is more than a means to an end for Bayard. And with history repeating itself, she is aware that this time their survival depends on whether or not they are able to see through the mistakes of their past.