Another quick review, "Billy Summers" by Stephen King. Tropes galore (hitman with a heart gets contracted for one last job), but King manages to keep things interesting including with a "book within the book" about Summers' past.
An easy recommendation for fellow constant readers, unless you're looking for a book with a strong supernatural bent. Full review (spoiler-free but does go further into the plot):
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!