Bridget is six months sober and starting to turn her life around when she is the sole witness to a professional hit. Despite the assurances of her FBI protector, Agent Victor Machado, Bridget knows her life is on the line. She flees to New York, telling no one, not even her Narcotics Anonymous sponsor, Malcolm.
In New York, Bridget reunites with her estranged twin, Siobhan. Wealthy, pampered and married to the strikingly handsome Andrew Martin, Siobhan lives what appears to be a fairy tale life - a life where no one knows that Bridget exists. The sisters seem to be mending their frayed relationship, until Siobhan disappears mysteriously, and Bridget makes the split decision to take on her sister's identity. She discovers shocking secrets, not only about her sister and her marriage, but also about Siobhan's best friend, Gemma, and Gemma's husband, Henry.
And when someone tries to hug Bridget in her sister's penthouse, she realizes she is no safer as Siobhan than she is as herself.