The British inmates of a POW camp think they have an informer among them after several escape attempts fail. One of the prisoners makes a dummy which they christen "Albert" and use at roll call in order to foil the German guards. The film is based on a true story. "Albert R.N." was a dummy constructed by John Worsley (1919-2000) in Marlag O, the prisoner of war camp in northern Germany for naval officers. It was used as a stand-in for a head count while a prisoner escaped and was used on two separate occasions. Worsley made a new 'Albert' for use in the film. Senior Commissioned Gunner (TAS) Lieut. John William Goble RN. aided Worsley in the development of "Albert" in the POW camp, Marlag O and acted as technical adviser for the film. Worsely made a third 'Albert' for the retrospective exhibition of his work held in Brighton College's Burstow Gallery. After the show, it was donated to the Royal Naval Museum Portsmouth.