Try and deduce the final sign
From Fallen London Wiki
| Spoiler warning! This page contains details about Fallen London Actions. |
From: Heart's Desire: Further Winners
A gouge in the stone, thin and an inch deep, as though scratched by a bony fingertip. How many people do you know with skeletal fingertips?
Unlocked with 
25 x Inklings of Identity, 
5 x Extraordinary Implications
Success
The Boatman
There is only one you can think of with the tenacity to win the Marvellous […] while also possessed of a skeletal visage: the Boatman who plies the slow river. You do not know if he would be willing to share with you what he knows […]
Description summary:
Time to die.
[Find the rest of the story at https://www.fallenlondon.com]
Success Instructions: You will need a Bengal Tigress to take as an offering to the Boatman.
You've lost 25 x Inklings of Identity
You've lost 5 x Extraordinary Implications
An occurrence! Your 'Known: The Boatman' Quality is now 1! (hidden)
Redirects to: Ambition: The Boatman
