Caught up in religious fervor when missionaries speak at her church, Alyce Benson impetuously pledges three thousand dollars to mission work in Africa, certain her wealthy father will honor it. When he refuses, Alyce discovers that his company has sponsored a racing car - and that the driver could win prize money. She conspires with her father's mechanic to secretly train and compete. But as Alyce sees needs in her own community, the money slips through her fingers.