My family purchased this book, along with the "Prove It! God" and "Prove It! Prayer" during the summer. I find this one to be particularly good, especially in her selection of quotes from sources ranging from the Bible to C.S. Lewis to Mother Teresa. The style of the writing is geared to teens, but the author is very direct, pulls no punches, and doesn't attempt to water down the truth of the faith and of Jesus's teachings. Many authors of adult books would be well-served to consider the effectiveness of books like these.
While published by Our Sunday Visitor, and intended primarily for Catholic teens, the book really is suitable for nearly all Christians. Other than a short mention in the belief that Jesus had no siblings and a mild criticism of denominations that are overly concerned with the end times, there is nothing that any Christian should disagree with and no reason that all Christians could not read, enjoy, and learn from this book. Buy it!