Where is the third assassin?

From Fallen London Wiki (Staging)
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?

Nun.png
Spoiler warning!
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  exactly 90,  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.