British operative Felicity "Flick" Clariet, her confidence shaken by a previous disaster, is given the nearly impossible task of recruiting and training a group of six women, to be known as the Jackdaws, to infiltrate and destroy Europe's largest telephone exchange, sabotaging German communications in preparation for D-Day.

"London, 1940. Emmeline Lake is Doing Her Bit for the war effort, volunteering as a telephone operator with the Auxiliary Fire Services. When Emmy sees an advertisement for a job at the London Evening Chronicle, her dreams of becoming a Lady War Correspondent suddenly seem achievable. But the job turns out to be working as a typist for the fierce and renowned advice columnist, Henrietta Bird. Emmy is disappointed, but gamely bucks up and buckles down....