Ringer follows the story of Bridget, a troubled young woman who witnesses a murder and assumes her wealthy twin sister Siobhan's identity to escape the danger. But as she takes on her sister's life, she realizes that Siobhan's world is not as perfect as it seems, and she finds herself in just as much danger as before. With a complex web of secrets and lies, Bridget must navigate her new life as Siobhan and uncover the truth about her sister's disappearance.

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Some TV shows that have similar genres and were produced around the same time as Ringer include Shardlake, Apples Never Fall, 3 Body Problem, Deliver Me, Dead Boy Detectives, The Outsider.