Nolan investigates an alleged home dispute where Linda Charles has escaped from her husband's house. Nolan later finds her walking in an alley, disoriented and speaking a foreign language. The husband and his assistant arrive and rather then let the police investigate pull guns on them. All three of them are later revealed by CIA Mike Weston and his FBI partner to be Russian agents, with Linda Charles, born Katerina Antonov, having gone rogue. Harper and Thorsen investigate a hit and run where the biker was taken away by the driver. As Harper tracks the stolen car to a warehouse, where she finds the victim knocked unconscious, the warehouse is caught ablaze, but she escapes with the victim. Nolan and Bailey discover a chip that Antonov lost in his patrol car, only for her to hold Bailey hostage. They break up the fight until the FBI arrest Antonov. Just back on the job, Lopez finds the warehouse fire was caused by the same assailant from the previous episode. Drug baron Elijah Stone has Aidan Merritt killed, as a last warning after Evers fails to get him released.
—KGF Vissers