"Young Captain Jack" relates the adventures of a boy waif, who is cast upon the Atlantic shore of one of our Southern States and taken into one of the leading families of the locality. The youth grows up as a member of the family, knowing little or nothing of his past. This is at the time of the Civil War, when the locality is in constant agitation, fearing that a battle will be fought in the immediate vicinity. During this time there appears upon the scene a Confederate surgeon who, for reasons of his own, claims Jack as his son.