Shortly before the start of WW2, renown British big-game hunter Thorndike vacationing in Bavaria has Hitler in his gun sight. He is captured, beaten, left for dead, and escapes back to London where he is hounded by Nazi agents and aided by a young woman.

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.