Do you reread books or are you done with them once you’ve read them?
I like to reread books sometimes! Rereading is especially good if I’ve just finished something heavy or intense; I can follow that up with something that I’ve enjoyed before so it doesn’t take too much effort and I can have a bit of a break. I also don’t have the greatest retention for what I read, so even if I’ve read something before there’s no way I’ll remember everything. And there are certain books that are comforting and cozy and those are great to reread when I want that kind of mood.
generally: no, unless they have something worth repeatedly highlighting or internalizing. i think this is mostly a function of being a non-fiction reader, though, where re-reading wouldn’t typically be a thing you do for pleasure so much as retaining the information at all and synthesizing it with other stuff.
I’ve reread several books, but never mysteries.