John Thaddeus

The crew of the Serenity are forced to seek help from the Alliance when Book is critically injured in a firefight.

The BAU team must profile a serial killer covered in tattoos who commits suicide, but leaves clues to the whereabouts of his last victim. Green Bay Packers wide receiver Greg Jennings guest stars as an evidence tech at a crime scene, and Dean Norris ("Breaking Bad") guest stars as Detective Barton.

Determined to recover millions of dollars worth of stolen Iraqi art, DiNozzo must go undercover and help a prisoner escape from a military detention centre, unaware that the man he is helping may also be a dangerous killer.

Jane and Maura are asked to present the case of a serial killer at a symposium for law enforcement; Jane and Maura make a discovery.

Shirley, Denny and Paul represent a congressman who is accused of failing to keep promises following a re-election.

Jack's interrogation techniques are questioned; CTU operatives close in on Marwan; Chloe is forced into field duty.