Lee Strobel is a journalist (formerly of the Chicago Tribune) who was once a religious skeptic, and now writes well-researched, highly readable books in defense of Christianity. This particular book works through a number of arguments that various scholars have put up for who Jesus is. By talking to different experts, he is able to ask the majority of the tough questions, and write up the answers.
A good, quick-to-read book, and a way of quickly getting across different arguments. Worth a read if you have your doubts, or know someone who does.