Bones: Season 4, Episode 23

4 - 23: The Girl in the Mask

When the head of Sachi Nakamura, the sister of Booth's friend, is discovered in Washington, D.C., her brother Ken, a detective from Tokyo, flies in to aid the search for his sister's killer. The investigation leads to an elite escort service, and the team must race against the clock when Sachi's roommate is missing as well.