Thanks to Erik Tenkar for point this one out.
If you read Dragon Magazine back in the early to mid 80s like I did, you'll remember the ads for Mercenaries Spies & Private Eyes.
It always seemed like a cool game, although we generally played Gangbusters or Top Secret. I wanted to check it out for a long time.
There is a Kickstarter for it out now, all of $6 for the PDF and $18 + S&H for the book plus the PDF. It's a good deal if nostalgia (or desire for a non-GURPS Cliffhangers game, I suppose) is pulling at you.
Mercenaries Spies & Private Eyes