Rebecca, a skilled forensics expert, is investigating a murder when she makes a shocking discovery: the victim's body looks identical to her own. As she delves deeper into the case, she learns that she was separated at birth from her two identical sisters. Determined to uncover the truth about her past, Rebecca embarks on a dangerous journey that takes her down a trail of secrets, lies, and deceit. With each twist and turn, she gets closer to uncovering the truth about her origins, but the closer she gets, the more she realizes that the truth may be more sinister than she ever imagined. Will Rebecca be able to uncover the truth before it's too late, or will her search for answers ultimately lead to her downfall?

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Some TV shows that have similar genres and were produced around the same time as Triptych include Sugar, Severance, Evil, True Detective, Yellowjackets, Deliver Me.