The Task Force springs into action to stop an elusive assassin on Liz's trail.

The death of a professional tennis player leads the Task Force to a doctor who may be fixing the odds for a major sports betting syndicate. Red digs deeper into Dembe's betrayal. Ressler struggles with sobriety.

After an inmate opens fire at a high-security prison, the Task Force investigates a contraband smuggler known as The Postman. Cooper revisits his past ties to the suspect.