"Hannah Gray is on the run. Unwittingly involved in an insurance fraud, she's leapt upon a friend's offer of tickets to an Adriatic cruise just to clear her head and figure things out. Maybe the fraud has been discovered - or maybe the threat of exposure exists only in her mind. Isn't that possible? But on the ship, she meets Renee Epstein, and that's when her life changes. Renee's husband is a scientist, and he's on the run himself. He's taken off with equations about to be used for a purpose he had not at all intended, but while he's trying to figure out what to do with them, he's scribbled them on the flyleaf of a book." "And now his wife has given the book to some fool woman she's met on the boat." Before he can retrieve the book, the Epsteins' lives take a shocking turn, Hannah herself is sucked in, and an extraordinary adventure begins through the Greek islands, Turkey, and the south of France, as Hannah Gray must use all of a hitherto unsuspected resourcefulness to battle her way through a situation that gets only more perilous by the minute.