Aaaaaaaaaaaaa!
Okay, thoughts.
Firstly, ha, I see that quote from another wizarding world.
Second, errata:
“Beaut>” could be either beaut or beauty.
“ take a few quick bites of foot.” - Freudian slip here, Azalea? Especially considering some of the later hints in this chapter. Regardless, foot should be food here.
Not an error but “ she did so without any sense of reticence.” I think just without reticence suffices, but that’s just from a flow perspective. For some reason that just jarred me out of the flow and had me considering if one can have a sense of reticence (you can). Not sure why it jumped out at me but it’s just for consideration when you do an editing pass later.
Again, not an error ““I’m not having my mind tampered with by some twiddling little pup of a thaumaturge like you,” she announced with a slight slur,” - when I originally read it I thought it meant that twiddling pup was a slur rather than she had a slur to her voice.
There’s an odd one where you say the investigation began to stall out. Stall is an old word, but stall out seems quite particular to motor engines which don’t seem to be a thing in the world at the moment. Maybe just remove the out there?
Lastly, the thoughts I have buzzing about after my 1am read:
I’m concerned how Claudio tried to appeal to Siobhan to get her to let him work magic on her.
Grandfather is definitely at odds with Claudio - why? Because he’s sloppy and leaving evidence? Or because he’s finding clues that lead him to suspect Claudio is holding out on him? Maybe something else.
Aimee telling grandfather he needs to praise Siobhan and take an interest in her because she’s feeling neglected was also very sweet. I enjoyed that.
The walking corpse with the tiny chewed up baby limbs was very creepy. Well done. I see why Siobhan has had nightmares for years.
Magic that tampered with the mind was one of the more widespread fears, even though most non-thaumaturges probably didn’t understand how it worked at all. Siobhan didn’t share that particular phobia—only a healthy wariness
Oh how things change!
Edit: about the hints - I had wondered if the spirit was driving Claudio to desire flesh, living flesh. But what if these horrors are a result of him trying to find a new host for the spirit? What if that’s what grandfather is trying to help him with?