Macbeth, the Thane of Glamis, receives a prophecy from a trio of witches that one day he will become King of Scotland. Consumed by ambition and spurred to action by his wife, Macbeth murders his king and takes the throne for himself.

Dennis Potter used his own background as a Russian language clerk in the War Office when writing this play for ITV's SATURDAY NIGHT THEATRE series. At the time of the 1956 Suez Crisis and the Russian invasion of Hungary, Private Bob Hawk reports to the London Intelligence Office where the strength of Soviet troops is under scrutiny.