Long before he became the storied mage-knight protector of House Galmoth, Ser Nerik Vazadon and his friends stumble upon an invisible castle. The ancient butler invites them to stay forever as the castle's masters, but as they begin exploring their new home, they sense something ominous is at play. With only their wit and friendship, they must unravel the mystery of the castle's magic and outmaneuver the force that seeks to hold them captive. In this captivating YA fantasy novelette, Ser Vazadon recounts the harrowing tale of his youth and the invisible castle that threatened to become his eternal prison.