You've found him!
From Fallen London Wiki
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From: Finding the Screaming Map: the Disgruntled Naval Officer
The Disgruntled Naval Officer paces across the little room. You'll get your map.
Unlocked with 
50 x Cat: Getting Warmer
Success
A promise to return
"[…] you can have the blasted map half. No, of course I don't have it on me. You think I can sleep with that thing nearby? I'll have to go and dig it up. I give you my word as a gentleman that I will bring it to your lodgings in a matter of days."
[Find the rest of the story at https://www.fallenlondon.com]
Success Instructions: The Disgruntled Naval Officer will send you a message when he appears in a few days of real time.
A living story will begin soon. (Activates the Living story The Disgruntled Naval Officer's Gift; this message is not displayed.)
Your 'Mouse: So Little Time' Quality has gone!
Your 'Cat: Getting Warmer' Quality has gone!
