One of the best if f not the best TV series I have seen in my 75 years, the BBC strikes again. Slightly slow to start but spellbinding once underway, in retrospect the slow start is perfect as are the final scenes I have not been able to watch another TV series or film since as I am still reeling with the pleasure, excitement and emotion engendered. The cast and crew are to be congratulated, especially Emily Blunt and Chaske Spencer a perfect pairing with a brilliant plot.