It's  finally time to catch up on all the tragedies and trifles of some of Britain's most lovable characters when the TV show "Downton Abbey" returns to PBS this Sunday night. 

There's poor Lady Mary to the noble Mr. Bates and of course, the trusty butler Carson. Back then, young servants relied on their elders for a proper education, but where do you learn to be a butler these days?

John P. Davidson visited a school for servants and wrote about it for the current issue of Harpers magazine. We spoke with him about his experience at the Starkey International Institute, what he calls a "bootcamp for butlers."