Brennan and Booth investigate the death of a 16-year-old pregnant girl who was found buried in a pile of street salt. During their investigation they uncover a high school "pregnancy pact" between the victim and some of her fellow volleyball players.
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.
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.
Brennan's father Max lands a teaching position at the Jeffersonian. When he ends up helping out with the murder case at hand, Brennan is noticeably bothered by his sudden presence in her professional life.
The team is led to a well-known physics research center after finding a piece of a meteorite in the ear of a victim whose pulverized remains were found in a garbage bag. Meanwhile, Angela's dad returns, seeking revenge on Hodgins.
