This is one of the RPGs I always wanted to play, but have never owned or played. I have played many of the other espionage, mercenaries, and private eye RPGs.
Mercenaries, Spies, and Private Eyes (MSPE) RPG is a fun and unusual RolePlaying Game (RPG) – https://www.kickstarter.com/projects/994700393/mercenaries-spies-and-private-eyes-rpg-by-michael.
Mercenaries, Spies & Private Eyes RPG was first published in 1983 by Flying Buffalo Inc. MSPE (as it came to be known) allowed players to run rpg adventures from the 1800’s all the way to the modern era, ranging from Victorian steampunk, and crime noir, to super spy thrilllers in the cold war. Michael Stackpole wrote the MSPE role playing game, using the Tunnels & Trolls framework as a jumping off point.
There have only been a handful of similar RPGs although most tended to cover only one aspect of the above (mercenaries, spies, private eyes). You can get a decent glimpse of some of the main competition: https://en.wikipedia.org/wiki/Category:Espionage_role-playing_games although it leaves out https://en.wikipedia.org/wiki/Merc_(role-playing_game) and probably a few others.
Flying Buffalo’s Facebook page: https://www.facebook.com/Flying-Buffalo-Inc-532205286852148/posts/ They are taking suggestions from both the Facebook page and the Kickstarter comments section.
You can read more about it on Wikipedia: https://en.wikipedia.org/wiki/Mercenaries,_Spies_and_Private_Eyes
The original version is available on DriveThru RPG (DTRPG) although the Kickstarter campaign will offer a cheaper PDF version of the new game than what you would pay on DTRPG for an older edition: https://www.drivethrurpg.com/product/211831/Mercenaries-Spies-and-Private-Eyes – PDF or print version.
https://www.kickstarter.com/projects/994700393/mercenaries-spies-and-private-eyes-rpg-by-michael – Ends Tuesday, March 26 2019 2:46 PM CDT
Here’s the standard Kicktraq link, ignore the Trending as it can vary widely during a campaign: http://www.kicktraq.com/projects/994700393/mercenaries-spies-and-private-eyes-rpg-by-michael/