When Carole Hanson and her father travel to Minnesota to visit relatives, Carole has the perfect assignment to create a family tree.Ever since her mother died, Carole has been curious about that side of the family, especially about an ancestor who journeyed north along the Underground Railroad.Then Carole discovers a secret lurking in her family tree, and she begins to question where she's come from.Do bloodlines matter as much with people as they do with horses?Carole discovers the answer when a dangerous horseback ride threatens the life of one of her relatives.