Sundance has signed on to co-produce the spy novel "Restless" with the BBC, with a cast that includes Michelle Dockery of "Downton Abbey" and Rufus Sewell of "Pillars of the Earth," according to The Hollywood Reporter.

The co-production of the TV version of the novel by William Boyd, which was adapted by the writer, is set in World War II and tracks a Russian spy seeking to infiltrate the British Secret Service, the story notes.

The spy will be played by Hayley Atwell of "Captain America," with Sewell playing a British secret service agent. Dockery will play the spy’s daughter, who discovers her mother’s secret years later, the story notes.

The project will air on Sundance later this year.

Michelle Dockery