Infernal encounters
From Fallen London Wiki
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From: Imports and Exports
The trade in Tracklayer souls is controversial. But Londoners sometimes come to the city simply to discreetly meet and transact with Devils.
Game Instructions: This is a bit more efficient if your city is near Marigold.
Unlocked with 
(1000 - 
Hinterland Efficiency) x Hinterland Prosperity (
Hinterland City - Chosen Site exactly 7) or (1050 - Hinterland Efficiency) x Hinterland Prosperity (otherwise)
Success
Noted
Devils prefer commerce to community; if they extract souls within the city, those souls rarely stay here for long. But it is valuable, in itself, to know who in London is counted among the recently-unsouled.
Habituated to the Hinterland is increasing… (+1 CP)
You've gained 1 x Blackmail Material
With Hinterland City - Chosen Site 5:
You've lost (1000 - Hinterland Efficiency) x Hinterland Prosperity
Otherwise:
- You've lost (1050 - Hinterland Efficiency) x Hinterland Prosperity
