In Two Rivers, Vermont, Harper Montgomery is living a life overshadowed by grief and guilt. Since the death of his wife, Betsy, twelve years earlier, Harper has narrowed his world to working at the local railroad and raising his daughter, Shelly, the best way he knows how. Still wracked with sorrow over the loss of his life-long love and plagued by his role in a brutal, long-ago crime, he wants only to make amends for his past mistakes.

Then one fall day, a train derails in Two Rivers, and amid the wreckage Harper finds an unexpected chance at atonement. One of the survivors, a pregnant fifteen-year-old girl with mismatched eyes and skin the color of blackberries, needs a place to stay. Though filled with misgivings, Harper offers to take Maggie in. But it isn't long before he begins to suspect that Maggie's appearance in Two Rivers is not the simple case of happenstance it first appeared to be.