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- A famous NY mansion is the crime scene for multiple deaths, including the latest of a famous ghost hunter.
- A TV show that searches for ghosts is on hand to check out the house when the host is killed.
- The house had been the scene for a murder 20 years ago of a woman who had been having an affair. Case was never solved and the husband was believed to be the killer. Castle and Beckett find the husbands body in a secret room, he had been dead all this time.
- The former arresting officer had the affair with the victim twenty years ago and had killed the married couple. The host of Ghost Hunters had been a witness to it as a little boy who lived nearby.
- Ryan and Esposito take their ladies out to dinner, resulting in a breakup between Esposito and Lanie.