After a marshmallow mix-up, Jodie, Freddi, and Samantha find themselves back in 1805 on an adventure with the famous Lewis and Clark explorers! Along the way, they meet Sacagawea, a seventeen-year-old Shoshone girl, and learn the ropes of wilderness travel. The girls must retrieve The Book from a wild bear, but in order to do so, they have to travel along with Lewis and Clark and face the dangers that come with discovering America.