Trying to help my grandparents find a new detective show to watch. For reference, here's what they've already watched:

Bosch Bosch: Legacy Beyond Paradise Death in Paradise Elementary Endeavour Father Brown Lewis Lie to Me Longmire Marple Midsomer Murders Murdoch Mysteries NCIS Poirot Shetland The Brokenwood Mysteries The Mentalist

While they generally seem to prefer British detective shows, I'm not sure which ones are left to recommend to them.