When the existing edition of a late medieval mystery play is clearly insufficient, but the lone manuscript on which that edition was based no longer exists, what recourse is there for future study of that play? Frédéric Duval proposes an answer to this question in a new edition of a mystery play that narrates visually the twenty-five-year career of the saintly personage popularly cited as Metz’s first bishop. First edited by Charles Abel in 1861, the Mystère de Saint Clément was based on a fifteenth-century manuscript copy that was destroyed in 1944. Despite the loss of the late-medieval version of that text, Duval’s new edition brings together the only surviving textual tools, and considerable editing skill, in order to represent what the lost copy may have looked like.