God's Problem: How the Bible Fails to Answer Our Most Important Question--why We Suffer
As always Bart Ehrman writes in an accessible and authoritative way.
Although he makes it clear that he is not a believer (although once was) this is not an attack on belief but an exploration of the different interpretations within the bible of why suffering.
Of all the books by Prof Ehrman i have read this seems to be the most personal and i think it gains from that. It would, i feel, be wrong to be dispassionate about suffering.
Whether a believer or not how to interpret suffering and our response to it is an issue for us all. This book is an excellent way of delving into this issue.