Agent Sam Durell, called The Cajun, hunts a rogue group stealing satellite secrets in Edward S. Aarons' Assignment Star Stealers.
Durell ends up having to (sort of) team up with his Russian and Chinese counterparts as well as team up (so to speak) with a childhood friend and sudden widow/heiress. As these things often do, it all ends up in a hidden base in the desert, with not too many left standing.
Aarons wrote a durable, I think underrated, spy series for several decades. I read these as a teen and then revisited a big batch a few years ago. This one came in a mixed box from a friend, and since I had not read one in a long while picked it up.
This is probably the latest in the series I have read, from 1970, but still as sober and fast-moving as ever. Features a pretty downbeat ending.
A great 50s-70s spy series, with elements from all those eras, and worth a look for espionage fans.