Sarah is on the run from a bad relationship when a lookalike stranger commits suicide right in front of her. Sarah sees a solution to all her problems by assuming the dead woman's identity and clearing out her bank account. Instead, she stumbles into a thriller mystery, and uncovers an earth-shattering secret: she is a clone. She learns there are more like her, genetically identical individuals, nurtured in wildly different circumstances, and someone...

A mysterious new clone appears this season, linking the current season to the past. Felix is having feelings of separation and loss because of the big revelation that Sarah is actually related to S, while Felix isn't.