The remaining team tries to solve a case.

While Jane and Weller partner with a mysterious man from Jane's past to find a missing person, the team races to stop an arms deal.

A surprising visit from Nas (special guest star ARCHIE PANJABI) leads the team to investigate a dangerous piece of technology that was stolen from the NSA. Meanwhile, Roman and Blake (recurring guest star TORI ANDERSON) grow closer as they attend a high-stakes poker game.

Weller and his former FBI partner reunite for a dangerous undercover mission while Zapata interrogates a past foe.

After some personal strife, the team must find a way to work together to track down missing nuclear warheads.

After receiving shocking news about Avery’s father, Jane and Weller must hunt down an elusive criminal. Meanwhile, Patterson’s father (guest star BILL NYE) helps the team (and his daughter) in the lab.

While Jane struggles to cope with a secret from her past, the team races to prevent an international crisis.

The team must decide whether to trust a prisoner who warns them of a dangerous plot. Zapata is caught between the FBI and the CIA. Roman and Crawford (special guest star DAVID MORSE) butt heads over how to handle a volatile situation.

In the season three finale, Jane and Weller hunt Roman back to where it all started. Can they finally stop him?

The FBI team and Avery attend a gala hosted by their target, Hank Crawford, in hopes of arresting him. Meanwhile, Roman grows closer to the Crawfords.

The team must partner with an oddball conspiracy theorist (guest star CHRISTOPHER FITZGERALD) in order to stop a deadly weapon from getting into Crawford's hands. Meanwhile, Roman struggles to maintain his personal life with Blake while completing a series of secret missions.

Mike and Annie try to keep Leigh away from her no-good ex, who's back in town; Eve trades with Graham for dirt on her former BFF.