Obviously this is a book about prayer. If you are an atheist you are not likely to enjoy this book. I still recommend athiests read it to better understand why friends who are believers pray. I've read several books by well-known atheiests. I think we can always learn from each other. 

This is an incredibly deep and moving book that is surprisingly very short (only 67 pages). I'm unfamilar with this author and look forward to reading more by him. The book focuses on prayer, the different types of prayer, and how to deepen your relationship with God through prayer. I learned several things and adopted some new habits for my own personal prayer practice. I read this book with my girlfriend and we both found it to be extremely moving and a wonderful tool to help us grow in our relatinoship with God and each other. Highly recommended.