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When a known cartel fixer arrives in NYC, 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. Meanwhile, Bill makes a shocking discovery when he returns to work after the death of his father, and the team enlists the help of Special Agent Stuart Scola.

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.

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. Meanwhile, Colin wrestles with Toni's return to the field, and Bill braces for Katie's response to his recent admission.

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.

When an extremely powerful and dangerous AI model is stolen by an employee, Colin and Bill look to track her down before she can sell it to the highest bidder. Meanwhile, Bill makes new revelations about his father.