A spy walks the ship!

 is a Sunless Sea Zee Random Event.

Event description
"They're good. Very good. Were it not for a single envelope sitting face-up instead of down on your desk, you might have never noticed."

Trigger conditions
 covers two nearly identical events. They're triggered if you have:  Determined Doctor = 1 Learning About: the Haunted Doctor ≤ 19 and 1 x Strategic Information or 1 x Moves in the Great Game 