What do You think about Decision At Delphi (1989)?
This book made me realise I definitely enjoyed simple whodunits over complex, politics-based cloak-and-dagger plots! Decision at Delphi is a drawn-out, boring story set in 1950s Greece, where "nihilists" try to destroy their own country in their hunger to take control (of what? I still haven't figured out!), in the aftermath of World War II. It was just too long - only I know how I managed to survive the 448-page tome. At last, I'm free of it - I can now look forward to fast-paced thrillers and mysteries!
—Vidya
Again, a first-class international espionage novel set in the 1950's 0r 1960's, involving those who hide amongst the citizens (it could be any nation, but this setting is in Greece), with the sole aim of destroying what they hold in contempt, and being willing to do anything it takes, kill anyone who gets in their way, or with whom they have a disagreement with, even their own colleagues, when they no longer can get what they want and their usefulness has come to an end. Even tho' the setting is set in "ancient" history, to younger readers, the ideas presented and the patterns the "barbarians" use are as old as Time itself, and it's repeated over and over and over again, even in our own day.In my view, Helen MacInnes will always be in the top 5 authors of this genre, no matter how many years, decades, etc. pass away since she died. Even at the end of her career, she was up-to-date with the trends of the times in the methods used by "barbarians" who want to undermine, control and destroy for their own good-and the "heck" with what anyone else wants.
—Kent