Sydney finds herself racing to clear Will's name when the Francie impostor frames him for the CIA intelligent leak by making him appear to be the other double of the Helix project. But Sark makes matters worse when he sends a team to extract Will, to make it look that he's guilty. Meanwhile across the globe, Irina and Sark discover a stumbling block could turn into an opportunity... with Sydney's cooperation.

Dixon secretly enlists Sydney to help him prove that Sloane is double-crossing the CIA and using APO to steal the Blackwell Index, a master blackmail list, and to reconstruct the Alliance of Twelve. Sydney makes her way into Sloane's house so as to copy the encryption key from his secure phone and crack his phone calls. When Nadia finds Sydney snooping around Sloane's computer, she doesn't tell him, but becomes disappointed in her sister and begins to lose trust with Sydney. Meanwhile, Vaughn discovers something disturbing about his late father when he visits his comatose, dying uncle who makes a remark about seeing his father - recently.