This new edition of Pete Greig s classic book includes a new forty-day study guide, a foreword from the Archbishop of Canterbury, and a new introduction from the author who has personally revised and updated the text throughout. Originally written out of the pain of his wife's fight for her life, but also the wonder of watching the prayer movement they founded changing lives around the world, Pete Greig steps into the dark side of prayer and emerges with a hard-won message of hope, comfort, and profound biblical insight for all who suffer in silence. ~ A Christian Classic. Justin Welby, Archbishop of Canterbury ~ A masterpiece. I cannot recommend it highly enough. Nicky Gumbel, HTB and Alpha ~ Simply the best resource I ve ever found on unanswered prayer, bar none. John Mark Comer, best-selling author.