Entertainment Tonight ET Online ETOnline.com

Emmy nominee Michelle Dockery is sporting an updated look, but still bringing the drama, in the Sundance Channel's new miniseries, Restless (premiering December 7) and ETonline scored an exclusive clip from the can't miss TV event!

PHOTOS - Go Inside Downton Season Three!

The two part series tells the story of Ruth Gilmartin (Dockery), who discovers that her mother Sally (the powerful Charlotte Rampling) was recruited as a spy during World War II. In fact, Sally is actually Eva Delectorskaya, a spy for the British Secret Service who has been on the run for thirty years.

RELATED - Downton Mastermind Creates New NBC Show

Through a series of flashbacks, we see Sally/Eva circa WWII (played by a never better Hayley Atwell) as she fights for love, honor and country.

Check out ETonline's exclusive clip above and tune in to part one of Restless on December 7 at 9 p.m. on the Sundance Channel!