In this story, Grace Harlowe and her friends, known as the Overland Riders, embark on an exciting expedition in the High Sierras. The group is composed of dynamic and adventurous young women who take on challenges and solve problems as they travel through the mountainous region.The plot centers around their experiences as they explore the rugged terrain, face natural obstacles, and encounter various characters along their journey. The adventure involves elements of outdoor survival, discovery, and teamwork. As the Overland Riders navigate through the High Sierras, they deal with unexpected situations, including environmental challenges and interactions with local inhabitants.