Erin's past is revealed during the long drive home.

Chapter 14 - See Tom Run

Tom Grayson returns home from a quick errand to discover that his family and guests have all mysteriously disappeared. Prior to this chilling discovery, he has been tormented with guilt by a secret that only he and a former lover share: the two have witnessed a brutal crime that Tom has refused to report. He knows that alerting the authorities would jeopardize all that he holds dear in life: his family and career. In a desperate search to find his missing family, Tom embarks on a journey that can only be described as nightmarish and surreal. When it becomes increasingly clear that Tom may lose something even more precious than his comfortable existence, his priorities in life shift dramatically as he becomes an unwitting detective with a mission. But will it be too late for him to set the record straight?