 After learning that the man she has known as Michael Vaughn is under investigation and suspected of being a double agent for another secret terrorist group called Prophet Five, Sydney begins to question whether their business and personal relationship over the years had all been a lie. When she discovers that she s pregnant with Vaughn s baby, she becomes determined to uncover the truth about him. Meanwhile, because of Jack s past betrayal by Irina, he begins to worry that his daughter may suffer the same fate that he did.