Sophie, a top student at Parsons School of Design, returns home in triumph after winning an award—only to catch her fiancé in a secret affair with her "sister," Veronica. Then a DNA report plunges her into the abyss: switched at birth at the hospital, she has been living Veronica's life for twenty years.
Cast out of the mansion on a rainy night, she is picked up by three men who claim to be her "older brothers," who take her to her real family. The Blackwood household looks humble and poor—plain, kind parents, and brothers all "sickly and frail"—yet something is off in every corner. What Sophie doesn't know is that this family she desperately wants to hold together is secretly the wealthiest on the East Coast—and that she, not anyone else, is the true heiress to a fortune worth hundreds of billions.