The Outdoor Girls in the Saddle by Laura Lee Hope is the seventh book in the Outdoor Girls series. The story follows the adventures of four friends, Betty, Mollie, Grace, and Amy, who love outdoor activities and solving mysteries. In this book, the girls travel to the Western United States to spend the summer on a ranch owned by Mollie's uncle. While there, they learn about a mysterious girl miner who has struck gold but is being chased by claim jumpers who want to steal her riches. The Outdoor Girls make it their mission to help the girl miner and catch the claim jumpers. Along the way, they encounter wild animals, ride horses, and explore the beautiful scenery of the Western United States. The girls eventually solve the mystery, and justice prevails. They also make new friends and have a summer full of fun and adventure. The book highlights the girls' love for nature and the outdoors and their ability to solve problems and help others in need.