The St. Francis Missal (W.75) is, at first glance, a seemingly humble manuscript. Bound in undecorated wood and leather, its cover is worm-eaten and cracked. As a missal (a book containing the texts used in the celebration of the Mass), it was primarily meant to be read from by the priest during the church service, and thus designed to be functional rather than lavish. Why, then, is this book one of the most intriguing in The Walters’ collection, as well as one of the most popular, visited by many from around the world each year?