A very faithful adaptation that reflects most of the strengths (and weaknesses) of the source material.
For example the ending felt a bit like a false summit. Solving the Bancroft murder should have been the climax of this detective novel, but the story keeps going and feels awkward afterwards. I had forgotten how badly the story lost me in the books until I was watching this show and I couldn't remember what I should be caring about. You can't build climactic tension if the viewer isn't even sure what they should be tense about!
Setting aside content, I just want to say Poe's actor was fantastic, but Rei's actress just didn't deliver on the same level as the rest of the primary cast.
And the sets were amazing. Some of the best I've seen on a streaming-only show.