In 1820 Sarah McCaffrey, fleeing arrest for her part in a failed rebellion, thinks she has escaped when she finds herself aboard the Serpent, bound from London to the colony of New South Wales. But when the mercurial captain's actions drive the ship into a cliff, Sarah is the only survivor. Adopting a false identity, she becomes the right-hand woman of Molly Thistle, who has grown her late husband's business interests into a sprawling real estate and trade empire. As time passes, Sarah begins to believe she might have found a home - until her past follows her across the seas ...