December 1942: as war rages on, the accidental death of a young man is almost unremarkable. Except this young man was patrolling the ground of Hursley Park House, where teams are designing crucial modifications to the Spitfire - and he was found clutching part of a blueprint. January 1943: Josephine Fox is seconded to Hursley to uncover the network responsible for information leaks to the enemy. When the dead man's father visits Bram Nash, convinced that his son was innocent of espionage and the victim of murder, her friend is also drawn into the investigation.
