This volume, part of the Lectura Boccaccii series organized by the American Boccaccio Association, offers close readings by top scholars of Day Four of the Decameron. As fans of the Decameron know, the Fourth Day opens with an important intervention in which the author defends his project against his critics, which coincides with a significant change in tone as the subject matter turns to stories with unhappy endings. The contributors approach the stories from a variety of perspectives, including the linguistic, philosophical, anthropological, and literary historical. These fresh readings of stories that are nearly seven hundred years old testify to the enduring power of Boccaccio’s masterpiece to speak to new audiences and to find compelling relevance even at a great distance from its immediate medieval context.