Spring 1943. In the darkest hour of the war for the Allied Intelligence, a new and disturbing menace appears - a saboteur among the factory workers at a Canadian munitions factory. Bomb Girl Gladys Witham, the daughter of a wealthy family, is covertly recruited to find the traitor on the new line. She must spy on her best friends, co-workers, and fellow agents, calling into question everyone and everything she has come to trust.