MIGHT there be a double-entendre in the title of John Boynton Priestley’s new novel, Faraway? Certainly the story takes one far away from England, whose most promising young novelist (if you’ll admit his comparison with Dickens) Mr. Priestley is. A Yorkshireman, as burly as they make ’em, he visited New York City a year ago and (like Dickens) made some unwelcome remarks. Later he was heard from in Holly wood and again in the South Seas. The effect of these travels I believe is visible in his new book.