Mystic Tide — Angela Dorsey

While riding her horse, Talent, across the wild Irish burren, Erin is seized by an unlikely pair, a ruthless woman and her clueless but loyal brother. Erin is terrified. Only one thought gives her hope: Talent escaped their clutches. When he gallops home, her family will know she needs help and will rush to save her. But Talent has plans of his own. With the help of a very strange girl, he sets out to rescue Erin himself.