Book excerpt: Diana Dearborn knows all about romance, at least in the books she writes. But passion eludes her in real life—until she's offered the chance to travel back in time to Camelot. The world of King Arthur and Guinevere is nothing like she pictured, neither is the knight she encounters on her return to San Francisco: Gawain, the hero of her current project. He's complicated, mysterious, and sexier than anything her imagination could conjure. And he's been waiting for her... Now, joined together in a desperate race, Diana and Gawain must prevent an ancient, evil force from wreaking mayhem in the all-too-real present. Diana must learn to trust Gawain—even while she encounters secrets about her own past. But even if their mission succeeds, does Diana's destiny lie with this man from another time—and will their love alter history forever?