I read cozy and historical mysteries, a bit of Paranormal/UF, and to mix it up, I read science and gardening books on occasion.
After a LOT of interruptions, I'm finally able to get back to this mystery.
I had to go back and double check, but yes, there it was, on page 37:
Everybody's trying to figure out: Cranton or Deacon? Deacon or Cranton? But everybody is (so far) forgetting there was a third man involved. At least, according to Sayers' narrative on page 37.