Description by couchtuner for CSI: Crime Scene Investigation Season 4 Episode 21 : A roller coaster runs off its track, leaving six people dead. The CSI team investigates whether this was an accident or foul play. One of the deaths, however, is not what it seems, and this takes the case in an unexpected direction. Meanwhile, Catherine and Warrick investigate the death of a 13-year old girl whose body was dumped unceremoniously outside town.
Watch It Here :CSI: Crime Scene Investigation Season 4 Episode 21 Turn of the Screws
