Moxie Wyoming wants a horse on her tenth birthday so she can ride in the rodeo like her mother and grandmother did when they were young. She does get a horse but not the one she hoped for. Instead Moxie Wyoming ends up with an old horse named Misty who falls asleep in the middle of the day! As Moxie and Misty become friends, Moxie learns that Misty has special secrets that make her not such an old regular horse after all!