Classic
I live in the US, and this is one of my all time favorite shows, irrespective of country of origin. Nothing in th US comes close.
This, Midsommer, Lewis, Morse, Endeavour, and Foyle are the best. And if you haven't seen it, all the various of Wallander shows from Sweden are right up there. The U.K. Version of Wallander, not so much.
I periodically rematch these as I really get a kick out of the rumpled, bumbling, politically incorrect Frost. Think "Colombo", only better.