Twelve-year-old Lucky Prescott craves adventure, but as a young lady of society she's only been allowed to experience adventure through books. That is, until one fateful day when Lucky, her father, and her aunt leave their neat-and-tidy city life and travel to their new home out west -- the Wild West. At first Lucky is excited, but during the long train ride to her new hometown of Miradero, she begins to worry. What if she doesn't make any new friends?...

Meet Lucky Prescott! Her life changes when she moves to Miradero. There, she meets Pru, Abigail, and a wild horse named Spirit.

After her overprotective grandmother has a stroke, Maya, an orphan, leaves her extremely restricted life in California to stay with her mother's family on a remote Wyoming ranch, where she discovers a love of horses and encounters a wild mare that her mother once rode.