Question: In which year was the first of the vampire-themed fantasy romance novels for which The Twilight Saga: The Official Illustrated Guide serves as a spin-off encyclopedic reference book first published?
Sentence (from "The Dark Heroine"): The Dark Heroine is a series of vampire-themed fantasy romance novels written by English author Abigail Gibbs, published by HarperCollins in 2012.
Relevant evidence: No