During the thrilling social change of the mid-1950s, four remarkable women who previously served secretly during WWII as code-breakers, turn their skills to solving murders overlooked by police. In the process they are plunged into fascinating corners of the city, forge powerful relationships, and rediscover their own powers and potential.
The story of Victorian serial killer Mary Ann Cotton, a poisoner whose methods leave no visible scars, allowing her tally of victims to mount, unsuspected by a Victorian society unable to conceive of a woman capable of such terrible crimes. Traveling around the North East, she insinuates herself into unsuspecting families, marrying and creating new families of her own – before killing them, taking their money and moving on.
Steve Arnott is a young officer who’s fallen foul of his superiors for refusing to help in the cover-up of an operation that ended in the shooting of an innocent father. He seems ideal to join AC-12, an anti-corruption police unit, just as it starts to investigate Detective Chief Inspector Tony Gates, the regional force’s Officer of the Year.