The authors of this book, after an examination of the history of the belief and of the arguments advanced for defining the Assumption, base their objections to a definition upon accepted premisses of Roman Catholic theology. They also discuss the present position of the cult of Our Lady in the Roman Church, as well as the effects which a definition of the Assumption might have upon the work of achieving Christian unity. It is as important characteristic of the book that it is written from a Roman Catholic point of view.