Titre original : Tipping Point
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 (Morgan Spector) finds a new way to keep tabs on the O'Connors, and Natalie makes a critical mistake while tracking down a lead.