Castle - Season 4 Episode 18 -

During Charles Carson's TV knockout show "A Night of Dance", spoiled-rotten rich girl Odette Morton, who made it to the semi-final, is murdered in her easily accessible lodge. Suspects include a previously knocked-out candidate who is now automatically restored, the presenter and someone he had a secret with. But forensic evidence shows Odette's very true identity was a big secret shared with some people from her past, which includes another murder.