Appeal to your shared history with the Boatman
From Fallen London Wiki
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From: Light Fingers: The Faded Music-hall Singer, Deceased
You have a bond forged over many a chessboard.
Unlocked with 
The Boatman's Opponent 40
Success
An exchange
The Boatman doesn't need to be reminded […] He is already setting out the pieces. […]
The Faded Music-hall Singer is deposited on the shore of the living. […] the Boatman blocks your way. "That game was to decide her fate," he says. "Not yours. […][Find the rest of the story at https://www.fallenlondon.com]
Success Instructions: Next time you journey to the Parabolan Base-camp from London, you will take the Music-hall Singer with you. Speak with her there to continue your story.
Return to your Parabolan Base-camp, where the sisters will reunite (Sets 
Light Fingers - Finding the Music-hall Singer to 3)
Wiki note: The player has to leave the regular way ... by reducing Wounds to 0 - or via Hesperidian Cider.
