Premise: Spy for a Day is a 1940 British comedy thriller film directed by Mario Zampi and starring Douglas Wakefield, Paddy Browne and Jack Allen. During the First World War a British farmer is abducted by the Germans to take the place of a spy about to be executed whom he closely resembles.
Hypothesis: Spy for a Day is a film about the World War and a farmer abducted by Germans as a replacement for a spy they are about to execute.