This is a limited series adaptation of Agatha Christie's The Seven Dials Mystery. 　　A healthy young man dies in his sleep, despite the ringing of eight separate alarm clocks. Gerry Wade had proved himself to be a champion sleeper; so the other house guests decided to play a practical joke on him... 　　Eight alarm clocks were set to go off, one after the other, starting at 6.30 a.m. But when morning arrived, one clock was missing and the prank had backfired with tragic consequences.