In the bitter Antarctic winter of 1910, in the waning years of the Edwardian era, a group of gentlemen adventurers wait out a raging blizzard in the close, perpetual darkness, poised for a strike at the South Pole. As the storm lifts, a new challenge faces Captain Sir Eugene Steward - to discover which of his twenty-five carefully chosen men has become a murderer - and what began as a probe for the bottom of the world becomes a probe for the depths of a man's soul.