Percival has spent his whole life on a remote hilltop with his grandfather Varghese, training with a sword and knowing nothing of the wider world. When his father Ironside kills Varghese and leaves, Percival sets out on a journey that leads him toward a prophecy: four knights are destined to challenge King Arthur's Holy Kingdom of Camelot. Strange powers awaken in him along the way, and he crosses paths with Lancelot, Tristan, and Gawain, the other three knights named in the prophecy. Set sixteen years after the events of The Seven Deadly Sins.