In April of 1917, Simone Spencer's world changes. Her beloved brother Will goes off to war, and Simone seeks a way to help. The passionate daughter of a feisty French mother and a rebellious upper-class father, Simone is not cut out for the society life she is meant to lead. So, when General Pershing calls for French-speaking American girls to operate the switchboards on the Western Front, Simone becomes one of the first brave "Hello Girls" whose courage helps lead the Allies to victory. In the end, Christmas brings the Spencers back together again.