When Michael Allen "crewed up" with Harry White in August 1941, it was the start of a four-year partnership as navigator and pilot respectively; together they formed one of the RAF's top-scoring night-fighter crews of World War II. Known in the night-fighter world as "Mike Allen", his job was to operate the primitive airborne interception equipment (AI) and guide Harry through darkened skies until his pilot could see the enemy aircraft ahead of them. This book shows how the art of flying combined with the science of radar (Serrate) made a powerful weapon in the hands of aircrew against enemy night-fighters threatening British bomber streams over Germany. Allen also clearly explains how Serrate and other radar devices work.