Going into this book, I was a little skeptical. I'd always been under the impression that G-d was the opposite of science. To somehow prove His existence would be to disprove it at the same time! But, of course, I was proven wrong. From the first page, the author gave clear, simple answers to some of the most commonly asked questions. How do we know that that G-d exists? How do we know His Torah is true? are among them.
The are two questions whose answers stuck out for me the most. Rabbi Waldman gave an easy answer as proof of His existence, but one that makes perfect sense in a way that makes you smack your forehead and say, "Oh! Why didn't I think of that?" At one point, he uses the analogy of an alien who marvels at the complexity of some fruit the first time he sees it.
As for proving the validity of the Torah, it's clear the amount of fact-finding that Rabbi Waldman put into this subject. His proofs were well-researched, and interesting as well. I was fascinated enough to share some of them with my family. For instance, he brings down proofs of the Flood. For example, whale skeletons have been found on mountaintops and in Central USA. A wolf and a lamb skeleton were found near each other on a mountain, the lamb without any gnaw-marks, as though they'd both run away from rising waters. They were obviously too busy to worry about eating or being eaten.
These are just a few examples of the interesting content in Beyond a Reasonable Doubt.
Though it was very thought-provoking, the book got boring at times. The author did his best to satisfy even the most cynical, and in doing so he was slightly repetitious. I also don't particularly recommend this unless you specifically have these questions, and are looking for in-depth answers.