This is a book which will appeal to all Christians. It deals not only with the idea of Heresy and what it means, describing some of the early heterodoxies like Arianism and Gnosticism, but also the post-modern heresies like the new-age fashionable fads that find the forbidden challenging and proclaim the death of God and demand spiritual freedom. McGrath analyses ancient and modern attacks on orthodoxy and places them in the context of the abiding Christian faith. This is not only a book for scholars. The ordinary reader will find much that is informative and thought-provoking. McGrath’s writing is highly accessible. He is above all a communicator.