On an Adriatic cruise, Hannah Gray meets Renee Epstein and her husband--a scientist on the run with a set of equations about to be used for purposes he had not at all intended.

When the Epsteins' lives take a shocking turn, Hannah finds herself in possession of the all-important equations. And as she is thrown into a deadly thrill-ride across the Greek Islands, Turkey, and the south of France, her fierce will to survive will show her exactly what she is capable of.

Genre: Mystery