Lured by a handful of scribbled words across a faded letter, Cara Hamilton sets off from 1896 Ireland on a quest to find the brother she'd thought dead. Her search lands her in America, amidst a houseful of strangers and one man who claims to be a friend—Rourke Walsh. Despite her brother's warning, Cara decides to trust Rourke and reveals the truth about her purpose in America. But he is not who he claims to be, and as rumors begin to circulate about an underground group of dangerous revolutionaries, Cara's desperation grows. Her questions lead her ever closer to her brother, but they also bring her closer to destruction as Rourke's true intentions come to light.