The Blue Sword (1982) by Robin McKinley is a young adult fantasy novel that follows the journey of Angharad Crewe, an orphan girl nicknamed Harry, who is drawn into the mystical world of the Damarian hill folk. After being kidnapped by King Corlath and discovering her own magical abilities, Harry trains to become a warrior and participates in the Laprun Trials. As the northern demon tribes threaten the land, Harry defies orders to warn her homeland, ultimately saving it with the power of the blue sword, Gonturan. Along the way, she discovers her deep connection to the hill folk, her royal heritage, and her love for Corlath, leading to a new era of unity between the two peoples.
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