Carpenter, a teacher at Juliet's high school.
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Mike Colter as Malcolm Ward, a recovering addict who serves as Bridget's Narcotics Anonymous sponsor.Nestor Carbonell as Victor Machado, an FBI agent whose job is to keep Bridget safe.Ioan Gruffudd as Andrew Martin, a self-made millionaire whose marriage to Siobhan is struggling as he deals with his work and keeping his daughter out of trouble.Kristoffer Polaha as Henry Butler, Gemma's husband, who works as a writer, is unhappy with his life and had an affair with Siobhan.Bridget assumes her identity and begins to learn that Siobhan had secrets of her own. Siobhan appears to commit suicide by jumping into the ocean soon after Bridget's arrival in New York. Bridget, a troubled young woman who goes on the run, after she is wanted dead by the mob, to her twin sister, Siobhan for help. Sarah Michelle Gellar as Bridget Kelly and Siobhan Martin.Bridget's life becomes more complicated as she discovers that her sister was hiding secrets of her own and that someone is trying to kill Siobhan as well. The only one who knows that Bridget is passing as Siobhan is Bridget's Narcotics Anonymous sponsor Malcolm ( Mike Colter). Bridget then assumes Siobhan's identity and tries to fit in among Siobhan's wealthy social circle, including Siobhan's husband Andrew ( Ioan Gruffudd), stepdaughter Juliet ( Zoey Deutch), best friend Gemma ( Tara Summers), and Gemma's husband Henry ( Kristoffer Polaha) with whom Siobhan had been having an affair. Soon after Bridget's arrival in New York, Siobhan, who had kept her sister's existence secret from her family, appears to commit suicide by jumping into the ocean. Fearing that Macawi, who has already murdered several witnesses linking him to previous crimes, will also kill her, Bridget flees to New York to meet her estranged twin sister Siobhan (also played by Gellar). She is under the protection of FBI Agent Victor Machado ( Nestor Carbonell), having agreed to testify against her employer, local crime boss Bodaway Macawi ( Zahn McClarnon), whom she witnessed committing murder.
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Bridget Kelly ( Sarah Michelle Gellar) is a recovering drug addict and stripper in Wyoming.