An incoming missile attack, which is detected by all but one of the country's early warning stations, proves to be a false alarm. Steed finds himself attending an exclusive New Year's Eve fancy-dress party on a train. The train terminates at a remote, deserted station, and a guest is killed with an arrow.
Elenco: Patrick Macnee , Honor Blackman , Diana Rigg , Linda Thorson , Ian Hendry .