During 1942 a special unit of the Royal Air Force is given the task of eliminating the threat which would expose the biggest secret of the war. By carrying out precision raids based on intelligence from agents in occupied Europe, a small anonymous group set out to achieve the impossible - a sure strike on small target. A shadowy team call on some unlikely men and women of the RAF to get the job done - using the ancient language of the British, subterfuge and skilful planning.