The study Why: 40 Days Pursuing Answers To Life’s Biggest Questions recommends the following books for answering the question, “Why Is The World So Messed Up?”
Evil and the Cross, by Henri Blocher
Is God to Blame, by Gregory Boyd
Satan And The Problem of Evil, by Gregory Boyd
The Problem of Pain, by C.S. Lewis
How Could God Allow Suffering and Evil? Tough Questions, by Garry Poole
A Grace Disguised: How the Soul Grows Through Loss, by Gerald Sittser
Can God Be Trusted?, by John Stackhouse