Where is the third assassin?

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A player-created Guide is available for this content: Ambition: Bag a Legend (Guide)
A player-created Guide is available for this content: Engaged in a Case (Guide)

How are the above links here?

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This page contains details about Fallen London Actions.

From: Ambition: Bag a Legend! 70 - The Assassins


When will you hear her midnight footsteps? Where are the whizzing bullets? Why are your kippers unpoisoned? What impenetrable scheme is she perpetrating?

Game Instructions: If you are already Engaged in a Case you must complete or abandon it before pursuing this one.

Unlocked with Ambition: Bag a Legend! exactly 90, Engaged in a Case: No Current Case


Success

A ghost

If you had a name or a face then finding her would be merely troublesome, not daunting. You have neither.