The Power in Prayer by C H Spurgeon and published by Whitaker House.
C.H. Spurgeon wrote this book for Christians who want to be mighty prayer warriors. He explains what to do so that you can be absolutely sure of success in prayer. As you read this book, you will discover: Why God is "bound" to answer our prayers; How short prayers bring big answers; Why God answers even faulty prayers; How to use arguments with God and When God answers the prayers of sinners.