Saturday, 8.30pm, 13th Street A two-part drama based on the William Boyd novel of the same name, this is the kind of program that easily might have been shown on the ABC or one of the commercial networks. Set in 1976 in the English countryside, and in Paris in 1939, Restless is a beautifully made and absorbing tale of a middle-aged woman who was once a successful secret agent and how, even in the later period, she remains in danger. When the woman — known to her family as Sally Gilmartin (played in the 1939 scenes by Hayley Atwell and later by Charlotte Rampling) — confesses to her daughter Ruth ( Downton Abbey’s Michelle Dockery) that her real name is Eva Delectorskya, Ruth is shocked. The mother has come clean about her identity because she feels she is being watched by men in the woods and wants her daughter’s help. Ruth thinks her mother is imagining things but picks up a spy-glass and gets quite a jolt. The top line cast also includes Rufus Sewell, Michael Gambon, Adrian Scarborough and Bertie Carvel.