Tomboy the Headstrong Horse recounts the real-life 1866 journey of Caroline and Nicolas Chevalier, who crossed New Zealand's rugged Southern Alps on horseback, accompanied by the spirited and wilful horse, Tomboy. While Nicolas documented their travels in his art, Caroline kept a journal. The story follows Caroline as she navigates treacherous rivers, dense forests, and muddy trails, forming an unbreakable bond with her headstrong horse. Along the way, readers witness the challenges of life in untamed wilderness amidst breath-taking landscapes, hear of Maori legends, and celebrate Caroline's determination and Tomboy's bravery.