Joan of Kerry: Joan and the Abhartach - Joan of Kerry, #1

Ancient monsters beware. Joan has spent her life facing down the monsters that no one else can defeat. But the rise of dark, hungry beings in the fields of Ireland brings portents of something more ancient and deadly. A monster out of myth. And a plague of death that could destroy everything in its wake. Joan is all that stands between this rising evil and her home. Just her. Her sword. And her one true ally. All in a night's work, for a hero and her dragon.