Jack confronts Gaines while Nina and Tony interrogate the mole's mother and find out about a secret bank account in Belgrade. There might also be other assassins heading for LA. Teri and Kim are examined by the CTU while Jack is held in the office. Palmer starts examining Jack's background wondering what they have in common. What was 'Operation Nightfall'? Meanwhile Teri and Kim are taken to a safe house and it turns out that one of Palmer's staffers is intimate with one of the assassins. But are Teri and Kim still safe?