One of the more productive evangelical theologians in anglicanism, Professor Alister McGrath of King's College, London, has recently published a helpful summary of Christian heresies and their history. The book is, as usual with McGrath, well-written, in a fluid and clear style. There is a lot of value for your money in the amount of information and reflection which McGrath manages to condense into a relatively short book (282 pages). Heresy will be helpful reading to anyone in thrall to Dan Brown and the DaVinci Code, with its facile and ignorant statements about Church History. There are, however, two short-comings which emerge at closer range. Even though McGrath takes on a crucial task in theology today, i.e to burst the bubble of our current infatuation with heresy and the widespread disenchantment with Orthodoxy, his interaction with specific heresies is at times lacking in depth and sensitivity. A gracious and fair accuracy in describing heretical movements has on occasion been sacrificed in order to cover more ground. The second defect is that McGrath seems to perceive Orthodoxy as a theological given, a legacy from the Christian past, rather than as an open-ended goal which our theological conversations and contributions strive towards. In McGrath's universe, heresies have rightly been refuted and rejected: end of story. In this context, it might be helpful to adopt the methodological stance of Karl Barth, which is quite different: that any heresy is only relatively heretical; that the Final Word has yet to be spoken on the unfortunate losers of dogmatic battles; that heresiarchs like Marcion, Arius, Nestorius and Pelagius remain as important to the task of theology as our most revered church fathers, as we never know just who might provide a liberating insight for our own reflection, and that we are not asked to perform the Last Judgment on one another. In doing so, we close a door that should have remained open, and silence living voices which ought to be heard, for the benefit of both humanity and church(see Protestant Theology in the Nineteenth Century, page 9).