downton abbey season 4 part 5 Lady Mary’s finally got something to smile about. Image courtesy of Instagram (@downtonabbey_official)

Now we’re getting somewhere! It’s been a bit of a slow boil, but the pot is finally startling to bubble on the great soap-operatic stove that is Downton Abbey. (That metaphor was way over-stretched, stopping now). Here are the three big developments that are adding a bit of much needed zing to a thus-far gloopy season: