Vampire Weekend

As Halloween approaches, Castle and Beckett are assigned to investigate the death of a young man found stabbed in the heart with a wooden stake in a graveyard. To Castle's delight, the two must delve into the world of vampires and werewolves to find the killer. The opening scene has a reference to Firefly, with Castle dressing up similar to Malcolm Reynolds (Fillion's character in Firefly) and saying he is dressed as a space cowboy.