I agree with Cofty, Ali Millar is a wonderful author, her Book though autobiographical is as easy to read as a Novel, and quite difficult to put down ! in places her prose is just beautiful, almost poetic.
Another ex-JW writer of stature is Jodie Chapman , her two Books so far are Novels, but draw heavily on her struggles with life as a J.W. The first Book "Another Life" is a great insight on the power of Love, but shows how Religion can spoil your life, so that you lose your real love perhaps. Her new Novel " Oh Sister" awaits my attention.