Eric Ambler, a British author of thrillers and screenplays, was well-known for The Mask of Dimitrios, which I haven't read but probably will in the foreseeable future. He is not as well known for Send No More Roses, published in the US as The Siege of the Villa Lipp. That's probably because it's not one of his books adapted into a film or miniseries. One line from it is on his Wikiquote page, however: "What use is an honest lawyer when what you need is a dishonest one?" This is eerily similar to that line about Saul Goodman, "You don't want a criminal lawyer... you want a 'criminal' lawyer."
Anyway, Send No More Roses, or whatever you want to call it, is great. The narrator, Paul Firman, is a great rogue. Frits Krom, a man staying in his house with two younger colleagues, is a social scientist who believes Firman is one of the world's great unpunished criminals. Krom is very much an irritating fool, an Ahab who couldn't beat the Whale in a game of checkers. But he's not Firman's biggest problem. No, that would be Mat Williamson, a sometime business partner who finds it convenient to end his association with Firman in a very permanent way. Things get tense, but they never stop being funny. Ambler was 68 when he published it and I think it was his second-to-last. In top form, though.
Final blogger's note: Yes, this post should have gone up last night. I mostly had it written in my head, and only after going to bed did I realize I hadn't set it down on paper. Or whatever.