In the aftermath of a violent shootout, Alex must convince the FBI to risk a dangerous covert operation to find Mikhail's hidden cache. With Agent Prado at his side, Alex leads a team to Philadelphia to retrieve the laptop from a secure government building, but Victor is a step ahead and orders the O'Connors to break in and steal the laptop first. Meanwhile, Katya discovers one of Natalie's most dangerous secrets, and forces her to choose between love and family.

Alex is confronted with the reality of his family's past just as his integrity is questioned at work. The FBI suspects a mole in the organization and brings in Special Agent Faber to investigate. Faced with testifying under oath and submitting to a polygraph test, Alex must for the first time fight against his own moral standards. Meanwhile, Victor finds a new way to keep tabs on the O'Connors, and Natalie makes a critical mistake while tracking down a lead.