Down the Long Hills (Louis L'Amour's Lost Treasures)

After the massacre, Hardy and Betty Sue were left with only a horse and a knife with which to face the long battle against the wilderness. A seven-year-old boy and a three-year-old girl, stranded on the limitless prairie. They were up against starvation, marauding Indians, savage outlaws and wild animals. They were mighty stubborn, but the odds were against them - and their luck was about to run out.