In the palace of Sakemoko
"Any common thief would have taken the jade and porcelain, both easily sold, in preference to an old book that is likely to bring little money and too much attention. I think we are safe to believe that the Book was the true target, and Kumo No U~ocha was killed only because he was present and might have resisted or identified the thief.
"Have we access to a mage who uses Knowledge magic? I know of spells that can replay an incident, under the right conditions and if not too old. I don't know those spells, but if we have no one else we can trust, sometimes I can cast a spell I have not studied.
"If I were to attempt that, I would have, effectively, only one try; how precisely do we know the time of death and location of the body? Also, do we have anyone available who could make an identifiable sketch from seeing someone's face a single time? That, I fear, is outside my talents."