In 1876, five siblings on an Arizona Territory ranch have to hide the fact they're orphans. If the authorities discover their secret, the Martin children will be removed from the Box M and placed in an orphanage in Tucson. The secret is safe with fifteen-year-old Ruth, fourteen-year-old Thad, and twelve-year-old Sarah; but can ten-year-old Bart and eight-year-old Billy keep it? To make matters worse, the Martins have made a commitment that they won't lie to Sheriff Packard or any other people who visit the ranch and wonder where the adult Martins are. These five siblings are about to have their faith and their courage tested as they've never been tested before!