Walking home, P. Psyche Sapiens sees a fire elemental on a burning building with her mostly-missing eye. The elemental had been set to hide the torture of Mae Bloomrandy octogenarian, agent of the Theurgic Institute, and Psyche's friend. Psyche volunteers to lend her unique vision and a (mostly-missing) hand to the investigation.
In the last few visits before she died, Mae brought a map for Psyche to verify the authenticity of. If real, the map would lead someone to the centuries-lost Eye of Enlightenment, the item upon which the Theurgic Institute built its whole system of magick. The knowledge the Eye brings can rearrange the world with its finder on top.
And the map might just be sitting on Psyche's kitchen counter.