Obtain the codebook, and sell it

A player-created Guide is available for this content: Khaganian Intrigue (Guide)

How are the above links here?

ID: 250313

Spoiler warning! This page contains details about Fallen London Actions.

From: The Pulling of a Thread: The Lost Codebook

The only real potential buyer is a merchant whom you know is an agent of a Surface power.

Unlocked with  exactly 503

Success

An exchange

Arranging to have the Ensign's debts forgiven in exchange for the codebook is a simple matter […] You […] wait for the buyer […] the Soft-Spoken Hungarian […] "Our friend in Vienna is uncertain about the Khanate," […] "Perhaps this will solve that equation."

[Find the rest of the story at https://www.fallenlondon.com]

•  An occurrence! Your 'Khanate: Chosen Faction' Quality is now 5 - White! (hidden)
•  An occurrence! Your 'An Opportunity in the Khanate' Quality is now 5 - Someone slips through a mirror!
•  You've gained 4 x Favour in High Places
•  You've gained 415 x Fistful of Surface Currency
• Your 'Scheme Complexity' Quality has gone! (hidden)
• 'Infiltrating...' has been reset: a conclusion, or a new beginning?
• Your 'Object of a Khaganian Intrigue' Quality has gone!
•  Taimen's Attention is increasing… (+2 CP, up to level 10)

If was previously 5:

•  You've gained 1 x Your Current Loyalty in the Khanate: (up to 59)

Otherwise:

•  An occurrence! Your 'Your Current Loyalty in the Khanate:' Quality is now 50 - A Surface power, Incipient!