Rob, I love the DCI Banks books. They're by Peter Robinson. PD James did the Adam Dagliesh books which I also loved. I started watching the DCI Banks shows on TV and liked them so much I started reading the books.
I like Sue Grafton's books and have been reading them for years. With exception of one where she changed up the viewpoint, I've liked all of her books. I do admit the the earlier ones were better than the later ones though.