Robert is off to America to help bail out Cora's playboy brother Harold who's got himself into a fix. And while he's gone, a farming venture at Downton sees Blake and Mary forced to put their differences aside.
Meanwhile, Rose's romance with Jack Ross hots up when they take a boat ride together – but have they been spotted by someone determined to make trouble for them?
Worryingly, Violet, the Dowager Countess, is taken ill – will she make it? And who will come to her aid?
And how will Anna cope with the return of her rapist, Mr Green?
Downton Abbey, ITV, 9pm