Mark and Katya are nearly exposed as spies by their own son, Alex. Then, in a brilliant bit of manipulation, Katya manages to convince Alex he is wrong. Katya's lies cause a rift between her and her husband and son. Victor is acutely warned of what will happen to him if he doesn't keep the O'Connors on a tight leash. Meanwhile, Alex partners with Agent Michelle Prado as part of a joint CIA-FBI task force to find the hidden SVR cache before it's destroyed. Alex's unique perspective is the key to unmasking the identity of a new defector, leading to a deadly confrontation with an SVR hit team.