Stephenie Meyer has been accused of plagiarizing one of her best-selling tomes. Self-described writer-singer Jordan Scott has sent a cease-and-desist letter to the Twilight mastermind, accusing Meyer of blatantly ripping off Scott's vampire love trilogy, The Nocturne—parts of which she posted online back in 2003 and which therefore, she claims, were readily available for Meyer to swindle. "The…