Ever since falling in love with Downton Abbey, we’ve been wondering: What will Michelle Dockery, whose portrayal of the headstrong and complex Lady Mary has made her the show’s breakout star, do next? Well, this weekend brings the US theatrical debut of Anna Karenina, where she plays Anna’s ally Princess Myagkaya. And today we get our first glimpse of Restless, a two-part Sundance Channel miniseries based on the novel by William Boyd. Dockery plays Ruth Gilmartin, a young woman who discovers that her mother Sally (the legendary Charlotte Rampling) was a World War II spy. The miniseries splits its focus between Sally’s adventures during the war and her life with Ruth decades later, when that past apparently resurfaces. And judging by the trailer, it’s stuffed to bursting with intrigue and romance. Click through to see a preview of Restless, which debuts December 7th.