A team of allied saboteurs are assigned an impossible mission: infiltrate an impregnable Nazi-held island and destroy the two enormous long-range field guns that prevent the rescue of 2,000 trapped British soldiers.

Naive Stanley Windrush returns from the war, his mind set on a successful career in business. Much to his own dismay, he soon finds he has to start from the bottom and work his way up, and also that the management as well as the trade union use him as a tool in their fight for power.