A fiendish, and lethal, device that eats electricity, designed as the ultimate killing machine, gets loose in a rural English village and electrocutes everyone it comes into contact with.
Steed and Cathy Gale find the worlds rarest stamp is the key to an evil and fantastic plot.
Mike Upton has been promoted to Junior Registrar, so there's a vacancy for a Senior Houseman. Stuart-Clark is the favorite, and as Mike is on the selection board, it looks promising for him.