The cinema was the most popular form of entertainment during the Second World War. Film was a critically important medium for influencing opinion. Films, such as In Which We Serve and One of Our Aircraft is Missing, shaped the British people's perceptions of the conflict. British War Films, 1939-1945 is an account of the feature films produced during the war, rather than government documentaries and official propaganda, making the book an important index of British morale and values at a time of desperate national crisis.