Consult with a master thief
From Fallen London Wiki
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From: The Alleys of London: the Criminals
He's good. Nobody this hard to find could be anything else.
Game Instructions: This will improve your Shadowy.
Unlocked with 
5 x Favours: Criminals, 
Shadowy 71
Locked with unmodified Shadowy 200 + 
Shadowy Gains
Success
Worth every favour and extortion
You don't ever see his face, but he says wondrous clever things from behind that heavy curtain.
Shadowy is increasing… (+76-125 CP (random), up to level 200 + Shadowy Gains)
You've lost 5 x Favours: Criminals
