When a prominent investor begins selling highly sensitive information to Korean agents, the team must go deep undercover at a high-end gala event to prevent a deadly invasion. Meanwhile, Bill struggles with troubling discoveries of his father's past.

In order to stop a terrorist cell carrying out a chemical bombing at an unknown location in the city, the team joins forces with an old school code breaker who is suffering from agoraphobia. Together, they decipher a seemingly unbreakable cipher.

After a Russian spy is poisoned by his own comrades, he offers to help the team neutralize a threat against U.S. assets in Russia in exchange for the dying spy's final wish: revenge.

When a known cartel fixer arrives in N.Y.C., the team tracks him down and discovers the body of a DEA agent. After it becomes clear the case is not what it seems, the team must work quickly to prevent additional murders.