SPOILER ALERT! There are 12 different enlaces to Casting Sides from this episode here, (they are all quite short) I didn't want to link them all individually, so just follow this and click on the enlaces that appear. Enjoy :)
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.