Ringer (2011)

After six months of sobriety and personal growth, Bridget finds herself in peril when she witnesses a murder. Fearing for her life and doubting the FBI's protection, she seeks refuge with her affluent twin sister, Siobhan, in New York. Initially, their reunion seems to heal old wounds, but the situation takes a dark turn when Siobhan disappears. Desperate, Bridget adopts her sister's identity, only to discover that Siobhan’s seemingly glamorous life is riddled with danger, leaving Bridget in a precarious position that threatens her own safety.