Bridget Kelly (Sarah Michelle Gellar, “Buffy the Vampire Slayer”) is a recovering addict, struggling to turn her life around. She’s six months sober, and beginning to get back on track, when she witnesses a professional hit. She’s placed in federal protection under the watch of Victor Machado (Nestor Carbonell, “Lost”), an agent determined to see that justice is done. But Bridget knows that Victor can’t keep her safe and she flees, telling no one, not even her close friend and Narcotics Anonymous sponsor Malcolm Ward (Mike Colter, “The Good Wife”). Hoping to buy some time, Bridget contacts her identical twin sister Siobhan Martin (also played by Gellar), and joins her in New York City, reuniting with her for the first time in six years. Siobhan is fabulously wealthy, with a strikingly handsome husband, Andrew (Ioan Gruffudd, “The Fantastic Four”) – who has no idea that Bridget exists. When Siobhan suddenly disappears, seemingly taking her own life, Bridget makes the split decision to take on her sister’s identity.