It's November 1944, Willi Graf, a German rocket engineer, is launching Nazi Germany's V2 rockets at London from Occupied Holland. Kay Connolly, once an actress, now a young English Intelligence officer, ships out for Belgium to locate the launch sites and neutralize the threat. But when rumors of a defector circulate through the German ranks, Graf becomes a suspect. Unknown to each other, Graf and Connolly find themselves on opposite sides of the hunt for the saboteur.