On returning to the estate, I took a brief lunch and began investigations in the library. I searched for any records related to the geographic area around the site, and found nothing that indicated knowledge of the chamber, aside from one bit of folklore about a beast that could be heard groaning on certain cursed nights nearby. I made note of that, but turned my attention to the iconography of the site as the most sensible alternative lead.
The runes were an old script. Most such markings in Britain use Norse runes, but these were most similar to a small handful of pre-Roman sites we had on record. As such, there was no translation available, or even any certainty that it was something that held a translatable meaning; but it did suggest that the reason no one knew about it was that it predated any of the attempts to categorize these things. That did happen from time to time, but my search showed no other such site that was still active when it was found. This line of research led nowhere.
The spiral, however. There were precious few references to it, all in secret documents not to be studied outside of their storage room, which I only gained access to last year when I took over the main body of field work from father and had not needed before now. The few instances of this specific red spiral appearing were tied to events with major attempted disturbance to the magical equilibrium of Britain. What connected the events, aside from the spiral itself, was not immediately clear. However, I had somewhere to start. I determined to speak with father about this later and, if needed, to call on a source who has been on Britain long enough to know about this sort of thing.
Evidence compiled for use during the trial of Father Benedict de Monte.