Fifteen dialogues loosely based on encounters of a Catholic apologist with Protestants, over the course of nearly five years of Internet discussions on lists, bulletin boards, and private correspondence. The most important and fundamental issues that divide Protestants and Catholics are dealt with: the relationship of Bible and tradition, the authority of the Church, whether the Church and tradition can be infallible like the Bible, how one is saved, the relationship of faith and works, whether Catholics believe in "salvation by works," grace alone, etc.