After his life is turned upside down when his wife is killed in a London terrorist attack, a brilliant but introverted CIA decoder takes matters into his own hands when his supervisors refuse to take action.
The story of Vera Atkins, a crafty spy recruiter, and two of the first women she selects for Churchill's "secret army": Virginia Hall, a daring American undaunted by a disability and Noor Inayat Khan, a pacifist. These civilian women form an unlikely sisterhood while entangled in dangerous missions to turn the tide of the war.