When young Monica Winters Borrero loses her luminous mother in an accident at sea, she is exiled from the tropical paradise that was her home. Grieving and cut off from a life among El Salvador's elite, Monica and her American father move to Connecticut, vowing never to look back.

Years later, an intriguing stranger, who has endured a terrible loss of his own, enters Monica's life, bearing an unusual request. Monica is propelled back to her lost world, retracing the shadowy last days of her mother, a marine scientist who had been on the brink of understanding the therapeutic...