After The Council, Reform and Reunion, this new book from the pen of the young theology professor, Hans Kung, comes as somewhat of a surprise. In the frame of a series of letters to his niece at a University, Dr. Kung answers the questions she raises in areas connected with discussions of unity of faiths. The book is a lucid and deceptively simple presentation. In the typically informal style of the personal letter, the author answers queries such as: ""Do You Discuss Things With Protestants?"", ""Does a Catholic Have to Defend Everything?"", ""Was It Always Like This?"", and ""Will Christianity Be Divided Forever?"". Frankly and bluntly he also treats the subjects ""Outside"" the Church, No Salvation"", and ""What Happens to Pagans?"". These and other key topics of interest especially in this time between sessions of the Second Vatican Council are discussed in a style which should attract thousands more readers than the usual theologian's efforts. Would that the publisher could figure out new ways to get the maximum number of Christians to read That the World May Believe. The cause of unity would be advanced noticeably in the area of the man on the street.