Halloween Sneak Peek! Castle Season 4, Episode 6: "Demons"

On next Monday's all-new Halloween-themed Castle, our crime-solving duo investigate the mysterious murder of a famous NYC ghost hunter. Could an evil poltergeist be responsible for his death? Castle seems to think so, but Beckett ain't afraid of no ghosts! Or is she ... ? Original Air Date: Oct. 24, 2011 at 10 p.m. ET on ABC.


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