To save a team of miners trapped underground, a down-on-his-luck ice road trucker joins a mission across treacherous terrain to deliver rescue equipment.

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.