More like The Diving Dames Affair

anchored on:mid 20th centuryspy thriller

but

Narrow

Mitchell GantSeries
series3 books1977
Thriller & suspense, tense in tone, about war.
“The lead character, Mitchell Gant, is an American fighter pilot and Vietnam veteran turned spy.”
from the catalogue
Start with Firefox →
Six Million Dollar ManSeries
series10 books1972
Science fiction, tense in tone, about robots, set in north america.
Start with Cyborg →
Get SmartSeries
series9 books1965
completed
Humor, funny in tone.
Start with Get Smart! →
The Incandescent OnesNovel
Fred Hoyle & Geoffrey Hoylestandalone novel1977
Science fiction, about aliens and space exploration, set in space.
Rick Brant Science AdventureSeries
series24 books1947
completed
Adventure.
“From Wikipedia: Rick meets Scotty and investigates sabotage occurring on his father's rocket experiment.”
from the catalogue
Start with The Rocket's Shadow →
KillmasterSeries
series19 books1968
Thriller & suspense.
Start with Operation Moon Rocket →