After some personal strife, the team must find a way to work together to track down missing nuclear warheads.
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.
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.
Weller and his former FBI partner reunite for a dangerous undercover mission while Zapata interrogates a past foe.
While Jane struggles to cope with a secret from her past, the team races to prevent an international crisis.
