Some promises last longer than a lifetime. When Aoife and her classmates set out on a school trip to the ancient monastic valley of Glendalough, she expects little more than ruined towers, quiet lakes, and perhaps a chance to escape the noise of the city. Instead, Aoife and her three closest friends stumble upon something far more dangerous-an ancient vow, a missing pilgrim, and the restless shadow of a monk whose secret was never meant to be uncovered. As bells toll in the night and whispers stir the mists of the valley, the friends find themselves pulled into a mystery that stretches back centuries. A locked reliquary, a name that cannot be spoken, and a vow that demands to be kept all draw them deeper into a story that was left unfinished long ago. The boundaries between past and present begin to blur, and Aoife must decide whether to turn away-or step fully into a legacy that has been waiting for her all along. Blending Irish folklore, atmospheric mystery, and supernatural suspense, The Guardians of Glendalough brings one of Ireland's most iconic landscapes to life in a tale about courage, loyalty, and the weight of promises that outlive those who made them. Perfect for readers who love YA fantasy adventures with real-world history, this chilling yet heart-filled story is about friendship, sacrifice, and finding the strength to carry a light into the darkest of places.