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.
tiếp theo Thursday on Jan22, after 4x12 Double Trouble in the Panhandle, in the place of Hero in the Hold, ngọn lửa, chữa cháy in the Ice will air INSTEAD.