Tales from the Darkside

My Ghostwriter — The Vampire (3x14)

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Hack writer Peter, writing worse and worse vampire stories, buys a coffin for inspiration and finds it occupied by Count Draco. Peter manages to protect himself, and the two strike a deal: Draco will supply new inspiration based on his life experiences, and Peter will write the books. Peter becomes wealthy, but refuses to share the proceeds. With the aid of Peter's secretary, Draco manages to get the drop on the writer and kill him, and the vampire and secretary strike up a new arrangement.