A book titled “The Traveller” has climbed the bestseller lists, but the author is a mystery. “The book, which has just been published in Britain, is written by the improbably named John Twelve Hawks who nobody, not even his New York editors at Random House, has yet met. Billed as a JD Salinger or Thomas Pynchon-style recluse, Twelve Hawks, which his publishers admit is a pseudonym, has refused to appear in public to promote his hugely successful debut work. Even a film offer from Universal has failed to flush him out.”