As July selection of the Religious Book Club, this book should be off to a good start. It is a Haddam House Book, Haddam House being a publishing project in the field of religious literature for youth. The purpose of this book is to give to Protestant young people an intelligent understanding of their Protestant tradition and of the distinctive Protestant principles. The first part gives the historical background, outlining the development of the Reformation, and of the trends which have influenced modern Protestantism. In the second part of the book the following ""Protestant principles"" are elaborated; the sole headship of Jesus Christ, God's redemption and man's trust, the Protestant conception of the church, the Bible, ethics and politics. While the ground is covered adequately it seems doubtful if young people not already committed to the church would read through the book. An assumption is made of interest in the church, its history and ecclesiastical organization, such as is not patent in the characteristic youth of today. But those already interested need a book like this to make their allegiance intelligent.