I see many of my favourites are already taken. Still, here goes (in no particular order):
EPITAPH FOR A SPY by Eric Ambler
This is Eric Ambler at the start of his career, spinning his yarn in Agatha-Christie-mode. 1938 - An innocent expatriate - an 'ordinary' guy at the wrong time in the wrong place; Ambler's standard hero - is wrongly accused of espionage and has to find the real spy amongst his fellow guests at a small hotel on the French Riviera. If he fails he will be extradited to his home country and the camps they started building there...
VENGEANCE by George Jonas
A non-fiction novel about the 1972 terrorist attack on the Olympic Games in Munich and the subsequent Mossad retaliation. Not in every detail reliable, accurate or even verifiable. Still, a highly probable account of the events.
THE EAGLE HAS LANDED by Jack Higgins
WWII espionage, and speculative action novel, a highlight of the sub-genre and the breakthrough for Jack Higgins' career. 1943 - The fortunes of war have changed drastically, the Nazi regime can already smell its own defeat in the ashes of the Battle of Stalingrad. In a weird turn of fate the German Abwehr gets wind of Winston Churchill's whereabouts on one particular weekend and Heinrich Himmler orders a desperate attempt to capture Churchill and bring him to Berlin. A team of elite German paratroopers, aided by IRA gunman Liam Devlin is to attempt the impossible...
A SPY BY NATURE by Charles Cumming
This one is especially ingenious. A young ambitious university graduate - overqualified, underpaid, somewhat inflated self-esteem - fails at the SIS recruitment test, but is offered a position nonetheless, albeit with MI5. His mission is to act as bait for a team of CIA spooks whose operation concerns industrial espionage right in the middle of London, amongst the British 'friends' and thus filling the special relationship with their very own version of life. Alec Milius, the first-person narrator, constantly is in doubt about his own ability to 'play' the soft target for the CIA team's efforts, all the while not realizing he's exactly the kind of unstable personality they would approach, without any need on his side to act the part. Ironically, Alec's shortcomings are indeed what brings the whole scheme down. Suddenly Alec finds himself in the middle of an operational disaster...
THE LITTLE DRUMMER GIRL by John le Carré
Another account of the Israeli-Palestinian terror war, this time entirely fictitious, yet probably even more accurate and spot-on than Jonas' book. Le Carré speaks for himself, so you already know to expect excellent quality. Read and compare it to THE KILL ARTIST by Daniel Silva. Mr. Silva owes le Carré more than just a drink...
Edit: One more for the road
THE STARS' TENNIS BALLS by Stephen Fry
Not an espionage novel in the strictest sense, yet events are set in motion by an aspiring SIS-Whitehall functionary to save his career and cover up his mother's IRA involvement. With one swift move a young guy's life is destroyed, his father and his girlfriend shattered by his disappearance, years of abuse and vegetating under drugs inside an ultra-secret mental home what is left of his existence. Until a fellow prisoner helps him escape and take his revenge.
This is of course a modern Monte Cristo story, a sad - and sadly plausible - retelling in a modern setting. The worst is, it's an allegory about what a back-from-the-dead character finds when he's expecting cheers and open arms. For the truth is, once people accept the death of a loved one they don't want them back...
Edited by Dustin, 11 June 2013 - 07:03 PM.