During an aristocratic family riding excursion, Tessa is forced onto the same horse as Blake, her glamorous stepsister who has tormented her for four long years. With their parents riding ahead unaware of the hostility, Tessa finds herself trapped in close proximity against the saddle. As the horse navigates the trails, Blake's suffocating dominance shifts into an unexpected touch when her hands settle around Tessa's waist. What begins as an uneasy ride soon spirals into a complicated tangle of psychological tension and forbidden attraction neither sister can escape.