Someone's watching in 'Closed Circuit'

"Closed Circuit," starring Eric Bana and Rebecca Hall as a pair of sleek English defense attorneys who make those Old Bailey wigs look positively haute, opens with security-camera screens, first four, then eight, then 12, then 15, dispassionately recording street activity and anonymous passers-by in London's Borough Market neighborhood. A truck appears on one of the screens. The music signals trouble. A bomb explodes. More than 100 people die.