the sake of those who have not read the preceding volumes of this series, to tell briefly who Frank and his chums were and what they had done up to the time this story opens.
Frank Sheldon had been born and brought up in the town of Camport, a thriving American city of about twenty-five thousand people. His father was American but his mother was French. Mr. Sheldon had met and married his wife in her native province of Auvergne, where her parents owned considerable property. They had died since their daughter's marriage, and in the natural course of things she would have inherited the estate. But legal difficulties had developed in regard to the will, and Frank's parents were contemplating a trip to France to straighten matters out, when the war broke out and made it impossible. Mr. Sheldon had died shortly afterward, leaving but a slender income for his widow. Frank had become her chief support. She was a charming, lovable woman, and she and her son were very fond of each other.
Frank had secur