Third novella: The Devil You Know by KJ Parker.
This one was delightful, if you're in the mood for a sensitive and conflicted demon, the world's smartest (and most dishonest) man, and a deal with the devil that may or may not be as ironclad as it seems. The story is not particularly deep; the entire thing consists of slowly revealing why the protagonist signed the deal in the first place, and what he's planning to do about it.
I loved both the MCs in this one. The demon is actually a pretty nice guy -- he enjoys culture, he collects rare books, he gives money to struggling artists, and so on. And the human is a scoundrel of a Renaissance man who has made his living through various types of cons, including amongst other things alchemical discoveries that may or may not be fake, philosophical treatises that are treasured around the world although he himself doesn't believe what he's written in them, and famous musical compositions. He can do it all -- so why did he sign that deal?
I haven't read much Parker, but I've gotten the impression that he usually writes rather dark or at least bloody stuff with lots of action. This is not that at all. This is witty and graceful and humorous and twisty, but nary a drop of blood or gore to be found. The logic doesn't always hold together, but that is so not the point here. And boy, did I love the narration! Speaking of graceful, Will Damron's delivery was pitch perfect and brought both the characters to life. Loved it.