Ask how she first learned about stones like the one you found
From Fallen London Wiki
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From: Conversation with Furnace or Alone with Furnace
Action Cost: 0
Evidently she has some experience.
Unlocked with 
Discovered: a Patch of Frozen Neath exactly 1
Success
Personal experience
"It was when we worked on the Devils' line, […] I had a partner then, and he knew some strange alphabets."
[…] Our Supervising Deviless would tease him that he couldn't read the stones. […] The Deviless has his soul on her mantelpiece. […][Find the rest of the story at https://www.fallenlondon.com]
You've gained 1 x Acquaintance: Furnace Ancona (Up to 2)
