In the darkest days of World War II, as Nazi bombers threatened Britain's very existence, an unlikely hero emerged: Tilly Shilling, a motorcycle-racing engineer with a passion for speed and innovation. As Royal Air Force planes fell from the sky—their engines failing at crucial moments—Tilly's ingenuity was put to the ultimate test. Racing against time, she developed a simple yet brilliant solution that would keep Britain's fighters in the air and change the course of the war. Listen to the thrilling story of how one woman's invention saved Britain's finest hour and helped turn the tide against Hitler's forces.