David Magayna

It's Christmas, and a serial killer is leaving displayed body parts all over Cumbria. A strange message is left at each scene: #BSC6. Called in to investigate, the National Crime Agency's Washington Poe and Tilly Bradshaw are faced with a case that makes no sense. Why were some victims anaesthetised, while others died in appalling agony? Why is their only suspect denying what they can irrefutably prove but admitting to things they weren't even aware of? And why did the victims all take the same two weeks off work three years earlier?

In 1942, the Gestapo sent out an urgent transmission: "She is the most dangerous of all Allied spies. We must find and destroy her." The target in their sights was Virginia Hall, a Baltimore socialite who talked her way into Special Operations Executive, the spy organization dubbed Winston Churchill's "Ministry of Ungentlemanly Warfare." She became the first Allied woman deployed behind enemy lines and - despite her prosthetic leg - helped to light the flame of the French Resistance, revolutionizing secret warfare as we know it.