"From the international bestselling author of Fatherland and Munich. Willi Graf, a 32-year-old German rocket engineer, a former racing-car driver, commander of a V2 unit based in the seaside town of Scheveningen in Occupied Holland, is responsible for firing missiles round-the-clock at London. And Kay Connolly, formerly a young actress, now a 24-year-old officer in the WAAF, is one of eight women sent to the newly-liberated Belgian city of Mechelen to try to use mobile radar units to pinpoint the V2 launch sites quickly enough that they can be bombed by the RAF. Both are in jeopardy. Graf, who developed rockets at Peenemünde under the supervision of his friend Werner von Braun, has already been arrested once by the Gestapo and is suspected of sabotage. Kay becomes convinced there is a spy in Mechelen who is betraying their work to the Germans. Their twin stories play out against the background of the V2 campaign--one of the most epic and modern but least explored episodes of the Second World War--interlocked, but separate, until their destinies bring them together at the end."