Alan Davies returns as Jonathan Creek, the master of illusion, who uses his brilliance and intellect to explain the unexplainable. This one-off special is written and directed by David Renwick and guest stars Sheridan Smith (yer one from 'Two Pints of Larger...' and 'Gavin and Stacey'). When Creek is called in to solve unexplained events in a vast Gothic house following several disappearances from a gloomy old attic known as The Nightmare Room, he's completely baffled. Seventy years on from the first disappearance, the room continues to claim lives. Can the ghost of a madman who preys upon human flesh really be to blame? When two young women take shelter in the attic from a raging thunderstorm, it's not long before the ominous 'presence' has claimed another victim.