Hidden, BBC One
Terrific cast, great writing, promising plot - can the show keep it up for four episodes?
One has learned to approach high-profile BBC dramas with mild apprehension, since apparent promise and oodles of hype frequently turn out to be fig leaves for feeble plotting and a half-baked script (The Hour, this means you. And possibly you too, The Shadow Line). Too many recent series should have "promising idea, pitifully executed" chiselled into their neglected, overgrown headstones.