Disaster looms as Jan's 16th birthday is on the horizon. Her failing the mission would mean her failing everyone she loves... or would it? She considers an unthinkable choice as she finally grapples with the lies B. has told her.

After a disturbed Iraq War vet shoots up a military base, the team exposes a sinister plot. As Jane and Weller race to stop a single-minded scientist, Jane recalls her own mysterious military past and contemplates a new relationship with Oscar.

After a tip reveals there's a mole within the FBI's New York Office, the team must hunt for the operative while facing extreme scrutiny from Inspector Fischer. The team's secrets threaten to be exposed, and everyone is a potential suspect - but some have more to hide.

Santa winds up on the naughty list after robbing a bank.

Voight’s suspicions ring true when a violent break-in steers the Intelligence Unit back to a chilling figure from a previous case.

After a disturbed Iraq War vet shoots up a military base, the team exposes a sinister plot. As Jane and Weller race to stop a single-minded scientist, Jane recalls her own mysterious military past and contemplates a new relationship with Oscar.

After a tip reveals there's a mole within the FBI's New York Office, the team must hunt for the operative while facing extreme scrutiny from Inspector Fischer. The team's secrets threaten to be exposed, and everyone is a potential suspect - but some have more to hide.

Santa winds up on the naughty list after robbing a bank.

Voight’s suspicions ring true when a violent break-in steers the Intelligence Unit back to a chilling figure from a previous case.

Fritz's sister, Claire, who claims to be psychic and tags along on an investigation of a possible homicide.

Brenda and Fritz's wedding plans are interrupted.

After a disturbed Iraq War vet shoots up a military base, the team exposes a sinister plot. As Jane and Weller race to stop a single-minded scientist, Jane recalls her own mysterious military past and contemplates a new relationship with Oscar.

After a tip reveals there's a mole within the FBI's New York Office, the team must hunt for the operative while facing extreme scrutiny from Inspector Fischer. The team's secrets threaten to be exposed, and everyone is a potential suspect - but some have more to hide.

Santa winds up on the naughty list after robbing a bank.

Voight’s suspicions ring true when a violent break-in steers the Intelligence Unit back to a chilling figure from a previous case.

Fritz's sister, Claire, who claims to be psychic and tags along on an investigation of a possible homicide.

Brenda and Fritz's wedding plans are interrupted.

An anonymous tip leads the team to investigate an urgent Death Row case - ultimately sending Zapata undercover. After nearly getting caught during the mole hunt, Jane considers leaving the FBI.

After a painting featuring one of Jane's tattoos is heisted from a gallery, the team discovers Jane is the real target. Wanting to protect her team, Jane goes AWOL.

Rusty hopes to end his involvement with the Stroh case.

Secrets are uncovered when Goodwin’s family comes together for Bert. Ripley and Frost treat two children stung by hornets in a treehouse. A member of the team struggles with relationship woes.

Charles grows increasingly suspicious of a colleague’s intentions. Lenox crosses a line to protect a patient. Hannah and Archer treat a soon-to-be father battling cancer.

Brenda's squad investigates a quadruple murder.

A rich financier under investigation is abducted.