Bones Season 5 Episode 17

Booth and Brennan investigate an unidentified skull and upper body at her alma mater, Burtonsville High School. Angela helps them identify the body as one of Brennan's classmates, and a possible connection is made to a murder that was committed 15 years earlier. In order to interrogate possible suspects, Booth and Brennan pose as a married couple at her High School reunion, where she reconnects with her only friend from high school, the dark-humored janitor.