The Manuscript is a large book stolen from Giles' library by one of Spike's vamps in Lie To Me, then later used as the key to Drusilla's cure in What's My Line. The original prop is almost certainly a found item, with the cover bearing numerous references to medaieval florence and Dante. My reproduction carefully reproduces reference photos of the original prop, including cryptographic pages only bareley glimped on screen when Dalton is trying to decode the manuscript.