The team only has a short time to find out what happened to a murdered car salesman before his foaming bones completely disintegrate.

The team investigates a sci-fi convention when a woman in a medieval princess dress is found murdered. With Booth’s back injured, Agent Payton Perotta steps in once again to help.

Booth is kidnapped by the Grave Digger and the Jeffersonian team must find and save him before it’s too late. Meanwhile, when evidence from the Grave Digger’s case goes missing, Brennan and Hodgins are suspected of taking it.

When a volunteer fireman is murdered at an ice rink, Booth and Brennan begin the investigation, but Booth must recuse himself due to a conflict of interest. When details come to light, Booth becomes a suspect in the homicide.

The death of female conjoined twins who worked in the circus is investigated. The investigation leads Brennan and Booth to go undercover as a Canadian knife-throwing act, and also causes Booth to come face-to-face with a clown.