Exactly right … and often with an actor you saw in one of the series showing up in another.
Yes. Really well written and well played.
Another excellent one (in the crime drama category) is Happy Valley, which stars a terrific actress named Sarah Lancashire as a police sergeant in West Yorkshire. (Her sister is played by Siobhan Finneran who was the nasty lady's maid, Miss O'Brien, in Downton Abbey.) There are only two seasons of this one, both available on Netflix.