633 Squadron of the RAF is tasked with an operation that is vital to the Allied invasion of France. They need to destroy a German base in Norway that is producing fuel for German rockets. It is an incredibly dangerous mission: due to where it is situated, getting to the base will require daring and precise flying and then there's the hordes of anti-aircraft batteries. The Norwegian Resistance are tasked with taking out the AA guns but if anything goes wrong with the plan it will be a suicide mission.