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xkcd #3173: Satellite Imagery
(imgs.xkcd.com)
Title text:
Every weekend I take an ATV out into the desert and spend a day tracing a faint "(C) GOOGLE 2009" watermark across the landscape.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3173/
You sound like a fellow espionage geek.
Two recommendations.
TURN : George Washington's Spies. Doesn't turn away from things like Washington owning slaves and the British freeing them, and it has lots of cute tricks, like a one-man submarine and secret writing on egg shells. AMC show.
Any of the WW2 spy novels by Alan Furst. "Night Soldiers" is about a Bulgarian fisherman whose brother was killed by a Fascist mob. He gets recruited into the KGB and fights in Spain.