Here's another strategy for finding espionage writers you might like:
Agents of Treachery
is a collection of short fiction by top espionage/mystery and spy-genre writers. An anthology like this is pretty rare — most authors in this genre don't bother because it's tough to tell a complicated tale of intrigue in often foreign lands and sometimes historical periods in short form.
I just started it and it's working well for me. The first story's by Charles McCarry and it's great writing and reading. Others in the book include Joseph Finder, Robert Wilson and Lee Child.
Alan Furst edited an anthology also, by the way, but his was novel excerpts. These are true short pieces.
Have at it!