Agatha Christie is the best-selling author of all time, according to The Guinness Book of World Records. Her novels have sold over 2 billion copies and have been translated into over 100 languages. Her first novel, The Mysterious Affair at Styles , was published in 1920, bit it was just a few years ago when Cleveland, Ohio playwright, David Hansen, re-wrote it for the stage. His adaptation is playing at the Chattanooga Theatre Centre now. The director is Steve Ray, head of the Theatre and Speech