May 2013. Her finances are in dire straits and author Sarah Blake is struggling to find a big idea for her next book. Desperate, she breaks the one promise she made to her Alzheimer's-stricken mother and opens an old chest that belonged to her great-grandfather, who died when the RMS Lusitania was sunk by a German U-Boat in 1915. What she discovers there could change history. Sarah embarks on an ambitious journey to England to enlist the help of John Langford, a recently disgraced Member of Parliament whose family archives might contain the only key to the long-ago catastrophe. April 1915. Southern belle Caroline Telfair Hochstetter's marriage is in crisis. Her formerly attentive industrialist husband, Gilbert, has become remote, pre-occupied with business and something else that she can't quite put a finger on. She's hoping a trip to London in Lusitania's lavish first-class accommodations will help them reconnect--but she can't ignore the spark she feels for her old friend, Robert Langford, who turns out to be on the same voyage. Feeling restless and longing for a different existence, Caroline is determined to stop being a bystander, and take charge of her own life. Tessa Fairweather is traveling second-class on the Lusitania, returning home to Devon. Or at least, that's her story. Tessa has never left the United States and her English accent is a hasty fake. She's really Tennessee Schaff, the daughter of a roving con man, and she can steal and forge just about anything. But she's had enough. Her partner has promised that if they can pull off this one last heist aboard the Lusitania, they'll finally leave the game behind. Tess desperately wants to believe that, but Tess has the uneasy feeling there's something about this job that isn't as it seems. As the Lusitania steams toward its fate, three women work against time to unravel a plot that will change the course of their own lives and history itself.