As the wise Mrs. M. knows, I NEED Sidney Chambers. Even though ALL of the remaining actors do a wonderful job, for me the show WAS Sidney Chambers. I didn't watch it to find out whodunit! I watched it to see Sidney's world, the murder mystery was incidental. Without his character brilliantly portrayed by James Norton, Grantchester is just too sad. I don't want to be reminded constantly of the loss. S4E1 was the end for me, too.