Now that is a good question, written by RC Sproul, is an apologetic focused book that looks at some of the tough questions that are posed to the Christian faith. I love this subject matter, and it takes a good look at the tough questions out there.
What I love the most is the simple nature of the book. In some of the hardest questions of faith and God, RC Sproul breaks the answers down to make them easy to understand and use in your life. I help teach young adults, and this is the best way to reach them and have them understand the areas in their faith that others may be questioning them on or that they themselves are unsure of.
My only complaint on the book is the lack of specific biblical references. Although he does reference the Bible, he often omits the specific verse/s used to answer. Otherwise, a good book all around to add to your library!