"The first rocket will hit London in five minutes. You have six minutes to stop the second."
Rudi Graf has dreamt since childhood of sending a rocket to the moon. Instead, along with his friend Werner von Braun, he has helped create the world's most sophisticated weapon--the V2 ballistic missile, capable of delivering a one-ton warhead at three times the speed of sound.
In a desperate gamble to avoid defeat, Hitler orders 10,000 to be built.
Now, in the winter of 1944, Graf finds himself in a bleak seaside town in Occupied Holland. Haunted and disillusioned, he's tasked with firing the V2s at London. Nobody understands the volatile, deadly machine better than he does.
Kay Caton-Walsh is an officer in the WAAF. She has experienced at first-hand the horror of a V2 strike. As the rockets rain down, she joins a unit of WAAFs on a mission to newly-liberated Belgium. Armed with little more than a slide rule and a few equations, the hope is that Kay and her colleagues can locate and destroy the launch sites.