A beep of the room's electronic keypad entry system sounded, and Kelsey let herself in, looking fresh-faced and relaxed.

They revealed only a further door, this time of grey steel, its lock taking the form of an electronic keypad.

His fate will be decided on a nightly basis by the audience, who deliver their verdict by means of electronic keypads.

In a break from dramatic convention, the audience becomes a jury and uses electronic keypads to pass judgement on the man in the dock.