Hayley Atwell, left, and Rufus Sewell in the Sundance Channel original miniseries "Restless."
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Sundance Channel, best known for its documentaries and other unscripted fare, is about to present a deliciously suspenseful spy thriller that signals a new initiative for the network: more drama. "Restless," a two-part miniseries that begins Friday at 8 p.m., would be an attention-getter if for no other reason than its blue-chip cast. But there is more to recommend "Restless" than its fine troupe of actors.