Having recently lost their mother in a car accident, fifteen-year- old Megan and her younger brother, Justin, find themselves moving to the mountains close to wilderness in Wyoming. It is a fresh start for their dad working now for an energy company and his wealthy elderly boss, who is their neighbor. There are many diversions for the teens in these mountains such as mines, canyons, caverns, bears, snakes, and wild horses. Their other close neighbors are a ranch family who help the teens adjust to Wyoming living and teach them to ride. While hiking in the mountains, Megan finds the wild horses and befriends one particular mare, calling her Prairie Fire. Will she be able to purchase this mare at the wild horse auction or be outbid? Can her cowboy neighbor help? Cleaning house for her father's wealthy boss adds more mystery to the whole summer for these newcomers and their friends and the conclusion of this Wyoming novel.