A Coffin for Dimitrios by Eric Ambler

A classic mystery with a postmodern twist: a protagonist who is also a mystery novelist, the result being that this 1939 novel is as much a comment on the genre (and even the genre to come) as it is a particularly delightful example of it. Plus: James Bond has been spotted reading it. Can’t get a better endorsement for a spy novel than that. Library catalog link.