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.