When the Government decide to build a Festival of Britain exhibition site, everything goes to plan, all except the fact that the main road and the pedestrian subway into the site, are blocked by a little corner shop, which is owned and run by a Mr. Lord and his family. When the Lords refuse to be bought off, and decline the compensation offered by the authorities. the police and the bailiffs try to evict them, only to come under fire from the family, who have barricaded themselves inside the shop.

Robin Hood is persuaded by two nobles whom he believes to be loyal to King Richard to recover secret plans attaining to the rescue of the king from captivity in Germany. Though disguised as a troubadour, Robin is betrayed and captured. Lady Alys and the merry men help him escape in time to foil an intended ambush on King Richard as he returns from the Crusades.

Unknown to everyone but his shady Middle Eastern bosses, watchmaker Hawkins is actually a professional hired assassin with a predilection for killing his targets with bombs. After disposing of a dictator and millionaire, Hawkins is assigned to kill a politician who is heading to a remote hotel, The Green Man, for a secret tryst with his secretary. There, however, Hawkins' plot is discovered by vacuum salesman William Blake, who determines to stop him.

An upper-crust family dinner is interrupted by a police inspector who brings news that a girl known to everyone present has died in suspicious circumstances. It seems that any or all of them could have had a hand in her death. But who is the mysterious Inspector and what can he want of them?