After a somewhat light, old-school episode last night (check out our official Bones review), Brennan and Booth investigate the death of a female roller derby skater whose body was dismembered next week.

In order to get more answers, they enlist Angela, woman of many talents, to go undercover as a derby skater. Meanwhile, Cam tries to uncover the details behind Booth's secretive hospital appointments.

What do you think our fearless hero is being treated/seen for?

Check out the first promo for "The Doll in the Derby" below:

Bones Promo: 'The Doll in the Derby'

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.