Castle 8x08 "Mr. & Mrs. Castle" (Winter Finale) - Castle and Beckett investigate the murder of a cruise ship entertainer, only to find themselves trapped at sea with the killer. “Mr. & Mrs. Castle,” the winter finale, will air on Monday, November 23rd on ABC. Subscribe to tvpromosdb on Youtube for more Castle season 8 promos in HD! br br Official website: br Official Twitter page: br Official Facebook page: br br Castle 8x08 PromoPreview "Mr. & Mrs. Castle" (Winter Finale) br Castle Season 8 Episode 8 Promo br Castle Season 8 Winter Finale Promo br Castle 8x08 Promo "Mr. & Mrs.