'Medieval Handbooks of Penance' is not a film, but rather a collection of texts from the Middle Ages that list the penalties for sins and the punishments that a person must undergo to atone for their sins. These books served as guides for priests to assess the seriousness of sins and determine the appropriate penalty. The synopsis is a summary of the manuals containing lists of sins and penalties for penance, which helped Catholics in the Middle Ages atone for their sins.