Don and his team are out to protect former radical Benjamin Polk from a determined sniper who wants him dead, and who is leading the FBI on a cat-and-mouse chase as he closes in on his prey.
Two FBI agents are killed during a bank robbery, Don's team is called to investigate. Meanwhile, Charlie and Amita begin to worry when Larry doesn't want to attend a conference in Geneva.
To find the person behind a deadly gambling ring that is running a high-stakes Russian roulette tournament, Don and his team are called in to investigate. Elsewhere, Don and Charlie become concerned over the financial health of Alan.
The team investigates several deaths that turn out to be copies of a soon-to-be-released movie, while Larry goes on his own personal adventure.
While tracking down a criminal who is running a heroin ring inside of a prison, Agent Ian Edgerton becomes a murder suspect when an informant is killed.
The team looks into the theft of a batch of scratch-off lottery tickets, and they find out the culprit may be a former lottery winner.
The team hunts down a serial killer who is targeting men who use prostitutes. Meanwhile, Colby and Nikki are involved in a car accident during the investigation.
The murder of two men takes the team to investigate a group of friends that had been sexually assaulted by a teacher at a younger age. Meanwhile, the perfect job opportunity pops up for Charlie and Amita, that may also put a wrinkle on their wedding plans.
After Charlie and Amita get married and begin preparations for their London adventure, they put a slight hold on their wedded bliss when they assist the team in helping Don track down the whereabouts of his gun after it goes missing.