Show Summary: Sarah Michelle Gellar stars as a woman, who after witnessing a murder, goes on the run, hiding out by assuming the life of her wealthy identical twin sister – only to learn that her sister's seemingly idyllic life is just as complicated and dangerous as the one she's trying to leave behind. 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 overboard during a boat trip, 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 kill Bridget in her sister's penthouse, she realizes she is no safer as Siobhan than she is as herself.
Bridget goes on the run after witnessing a murder, hiding out by assuming the life of her wealthy identical twin sister Siobhan - only to learn that her sister's seemingly idyllic life is just as complicated and dangerous as the one she's trying to leave behind.
As the vow renewal nears, Bridget realizes she first needs to tell Andrew the truth about who she really is. Meanwhile, just as Bodaway Macawi starts to close in on Bridget, Agent Machado is forced off the case and Henry decides whether he should tell Bridget the truth about Siobhan.
Catherine’s plan to drive Andrew and Bridget, posing as Siobhan, apart unravels. Agent Machado discovers who wanted to kill Siobhan all along and rushes to intercept the killer before it is too late. Meanwhile, Siobhan’s plan to help Henry backfires when the main witness suddenly dies.
Still posing as Siobhan, Bridget admits to Agent Machado that someone tried to kill her months earlier and she thought it was Andrew. Bridget goes to Henry’s apartment, where Siobhan overhears Bridget accuse Henry of Tyler’s murder. Meanwhile, Catherine goes to desperate extremes to bring Andrew closer to her.
Bridget decides that the only way she will feel safe is if she testifies against Bodaway Macawi. Agent Machado gets suspended from the FBI, while Henry grows impatient with Siobhan’s plan and tells her she needs to let go of her revenge plot or they cannot be together.
After an attempt is made on Bridget’s life, Agent Machado is determined to find who was responsible. Henry accuses Siobhan of putting a hit out on Bridget, while Bridget thinks Olivia was behind it. Meanwhile, Andrew admits to asking Malcolm to leave town and Juliet goes missing.
