Every month ESSENCE Books Editor Patrik Henry Bass will chat with your favorite authors on Twitter, @essencemag (hashtag #ESSENCEBooks). Up first was THE PERFECT MARRIAGE, by Kimberla Lawson Roby. Here the's story: Denise and Derrek Shaw are the perfect American couple. Happily married for 15 years, they have a wonderful daughter, successful careers, and a beautiful house. They also have a shocking secret: a dangerous addiction to drugs.