According to a report from the entertainment industry website The Tracking Board Luther actor Idris Elba and Oprah Winfrey may star in an upcoming big-screen adaptation of the best-selling novel The Shack. And, as noted by Deadline, Forest Whitaker is currently attached to direct the $30 million film for Lionsgate later this summer. The novel—which sold more than 18 million copies—by William Paul Young was somewhat controversial among Christians when it was released in 2007. In the book, a man who has suffered the tragic loss of his daughter encounters three individuals, that are representative of the trinity, who offer him spiritual healing and comfort while visiting with him in a secluded shack …