Overview
Seven Days to Noon is a 1950 British drama/thriller film starring Barry Jones directed by John and Roy Boulting.
Plot
In 1950, the British Prime Minister receives a letter from a man who says he has stolen a nuclear weapon and will destroy the centre of London next Sunday at noon, unless the British government declares that the country is going to stop making such devices. The letter is signed "Professor Willingdon", which is the name of the senior researcher at Britain's atomic weapons development facility, the fictitious Wallingford Research Centre, so, on Monday, Detective Superintendent Folland of Scotland Yard's Special Branch is charged with investigating whether the letter is a fraud or represents a genuine threat.
At the Research Centre, Folland finds that Willingdon has gone missing, as has a (fictitious) UR12 nuclear bomb, which is small enough and light enough for an individual to carry. He recruits Stephen Lane, Willingdon's assistant, to help with the search, and they go to Willingdon's house. Neither Lane, nor Willingdon's wife or daughter, Ann, had noticed anything unusual in the Professor's recent behavior, but troubling notes are found among his papers which, coupled with some remarks he made to the local vicar, who is the last person known to have spoken with Willingdon, indicate he had come to believe that his life's work was being used by the government for evil purposes.
On Tuesday, Willingdon, who is carrying the bomb around with him in a Gladstone bag, sees his picture in the newspaper (though it is not stated why he is wanted), so he has a barber shave off his moustache before looking for a place to stay. He rents a room from Mrs Peckett, but spooks her by pacing around his room all night. After he has left the next morning, she sees an article about the hunt for someone who is killing landladies, so she calls the police. A quick-thinking constable realises the description matches Willingdon, and a car is sent to the boardinghouse. Willingdon returns, but he sees the police car parked outside the building and is able to make a quiet getaway.
From Wikipedia (CC BY-SA 4.0).