Bones Season 2 Episode 8

When the skeletal remains of a federal prosecutor who disappeared five years earlier are found in the desert outside Las Vegas, the team suspects it to be tied to the mob. They then find the body of a woman a few yards away, who they suspect was killed by the same person. The woman's injuries lead Brennan to believe she had a long history of domestic violence. When the husband denies having hurt his wife, they are led to a Vegas loan shark, where an anonymous lead takes them to the world of gambling and underground ultimate fighting, where Booth and Brennan go undercover as Vegas high-rollers. In an attempt to uncover the mystery, Booth risks his life.