When Professor Willingdon becomes wary of the nuclear weapons he is helping build, he steals a warhead and threatens to detonate it in London in seven days unless the government begins nuclear disarmament. As Willingdon goes into hiding, Detective Folland of Scotland Yard sets out to find him. Willingdon's daughter Ann also joins the cause, hoping she can talk sense into her father before he causes a catastrophe.
as Professor John Malcolm Francis Willingdon
as Superintendent G.W. Folland
as Goldie Phillips
as Ann Willingdon
as Stephen Lane
as Mrs. Emily Georgina Peckett
as Arthur Lytton, the Prime Minister
as Mrs. Willingdon
as Station Policeman
as Woman in Phone Box
as Army Mechanic
as Man on Bus (uncredited)
