From publisher blurb:
Mercenaries, Spies and Private Eyes (MSPE) was first published in 1983. We have finally made a pdf of the original book (with the original classic miniatures ads in the back!)
This is a rpg very similar to the classic Tunnels & Trolls fantasy rpg, except it is (as the title suggests) for more modern characters with guns and whatnot. It is more of a skill based system than T&T.