The Sundance Channel’s two-part miniseries “Restless” is not a particularly tight suspense story. Adapted by William Boyd from his 2006 novel, it is too steeped in mood and the story suffers from a few underdeveloped and unearned plot turns. But the acting, particularly by the three female stars, Michelle Dockery, Hayley Atwell, and Charlotte Rampling, more than compensates.
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