Trying hard not to give away spoilers…..Just watched this excellent good verses evil timeless concept straight through on Britbox. And Rupert Penry-Jones is perfect as a character I never saw coming though it’s woven all the way through each series. It made me wonder who the other characters really were…. Alex Jennings perhaps more obvious than the rest, tempting Joseph.
Maybe the cancelled 5th series would have laid it out more and there is a letter online purportedly from the writers sketching the plot, but it will be a pleasure to watch it all again to guess the true characters.