"Catharism was the most radical of medieval heresies. Since it touched most areas of Europe in some degree, research on its character and fortunes makes formidable demands on the learning and linguistic ability of any scholar who tackles it, not to mention demands also on his judgement. Malcolm Lambert, well known for his lucid and authoritative writings on medieval heresy, is a match for this challenging task. His new book, The Cathars, is to be welcomed as the most comprehensive and up-to-date treatment of the subject now available in English." Alexander Murray, University College, London "Lambert's command of the literature and his ability to integrate it into a coherent narrative are unmatched. His book deserves to become the standard account of medieval Catharism." Medieval Review "This is the first comprehensive study in English of the most mysterious and radical of medieval heresies. Malcolm Lambert ... 'combines scholarly investigation with lucid narrative.'" TD Book Survey "Malcolm Lambert, with deep erudition allied to pristine sensitive prose, masterfully narrates [the] distinctive history [of] the cathars ... The Cathars ... is, quite simply, indispensible." Catholic Historical Review