The Phryne Fisher series are traditional, rather than cozy, because there is both blood AND sex on the page, but the most incredible thing is how character-driven these books are.
Most mysteries are interesting for the plots. You want to know who did The Crime and why. That’s why I find so few mysteries rereadable. Once I know the answer, what do I care about discovering it again? (I struggle with this in my books, not going to lie.)