If you take A Level theology these days then either Peter Vardy is your primary resource, or you were born with the abilities of Thomas Aquinas. (Or perhaps you are destined to fail - who knows?)
But with this book, Vardy has surpassed himself. This is not simply a textbook for late teens cramming their way into college, but the only recent contribution to an issue that everyone in the modern world really should know more about.
For students, there are thorough but concise accounts of all the major contributors to our study of the nature, extent and implications of evil. That's good - they need to do more homework anyway.
But for the rest of us, a more complete and comprehensive guide to the most fundamental problem of moral life in our times simply does not exist.
You cannot read this book without questioning your own assumptions about right and wrong, without examining the rules you apply to your judgement of different peoples' interpretations of the same rules, or without learning something about how evil can often depend upon the place you are standing.
And if this book offends you, upsets you, or causes you to change your opinion about something, then that is all the more reason for you to read it.