This volume contains a comprehensive treatment from a Catholic viewpoint of the perennial meaning and function of the miraculous in human life. It includes a study of basic principles relating to the possibility, actuality, types and criteria of true miracles, as well as an investigation of diabolical phenomena, occultism and mental disorder in their distinction from the truly miraculous. An historico-theological survey is made of the miracles recorded in the Old Testament and the New Testament, followed by a description and discussion of many ancient and modern miracles reported after the time of Christ. A separate chapter is devoted to the subject of apparitions, including those at Lourdes and Fatima and the recently reported apparition of Christ to Pope Pius XII. The author's treatment of all these matters is interesting and on an intellectual plane, based on scholarly sources, which are listed in the bibliography appended, and one that avoids credulity, although it is emphatically antisceptical at the same time. The book is addressed to believers and non-believers alike. Many in both groups should find it informative, thought-provoking and inspiring.