A young, spirited girl named Lucky Prescott relocates to the small frontier town of Miradero to live with her estranged father. Still grieving the loss of her mother, a famous horse rider, she's initially reluctant to embrace her new surroundings. However, her life takes a thrilling turn when she encounters a wild mustang stallion named Spirit, who has been captured by a group of wranglers. They bond instantly, sharing an unspoken connection that fuels Lucky's sense of adventure and longing to emulate her resilient mother. Through Spirit, she meets two local girls, Pru and Abigail, who become her close friends and fellow riders. Together, they embark on daring escapades, learning about trust, friendship, and courage.

As the girls' connection with Spirit grows, they discover a sinister plot involving the wranglers, threatening the mustangs' freedom and Spirit's future. Meanwhile, Lucky grapples with understanding family dynamics and finding her place in the world. She also learns about her mother's legacy, fueling her determination to prove herself and protect those she cares about. With her friends and Spirit by her side, Lucky musters the courage to stand up against adversity, embrace her heritage, and ensure the safety of her newfound home and its wild inhabitants. Her journey becomes one of self-discovery and empowerment, aligning her destiny with the spirit of adventure and loyalty she had been searching for all along.