One of the best series I've ever watched that is now all on Prime is Endeavor, a British detective series that will stay with you long after you get to the last scene.
The haunting music theme by Barrington Pheloung is beautiful.
Another is Wycliffe. Another British detective series. The acting in both of these and the plots, direction, everything. You will wonder why you ever watched anything else.
"If you walk the footsteps of a stranger, you'll learn things you never knew. Can you sing with all the voices of the mountains? can you paint with all the colors of the wind?"