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“MASTERPIECE,” 9 p.m., Channel 6 “The Inspector Lynley Mysteries, Series VI: One Guilty Deed,” in which a star witness is found shot dead on the tidal flats of the Essex marshes — the detective’s childhood holiday retreat.

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“Mad Men,” 8 p.m. AMC The astute period drama about a 1960s Manhattan ad agency continues with an episode titled “Maidenform.”