Brennan makes a shocking discovery while trying to identify a Jane Doe; Brennan tries to come to grips with her parents' past.

After the disembowelled body of an FBI agent is found burnt and hanging from a roof, Brennan and Booth find themselves deep in the middle of a dangerous conspiracy.

After construction workers find an archbishop's body with the kneecaps surgically removed, the team returns to the case of the Widow's Son serial killer.

Three days before Christmas the body of a bearded man in a tailor-made Santa outfit turns up in a sewer; Brennan visits her father in prison and plots a nontraditional holiday reunion.

Max goes on trial for the murder of FBI Deputy Director Robert Kirby and all the team members but Brennan are called as expert witnesses for the prosecution.