In Incarceron, a vast intelligent city-prison sealed off from the outside world and hidden from everybody except the Warden, two young people, Cynthia, the Warden's daughter who is trying to escape an arranged marriage, and Finn, a young prisoner who cannot remember his childhood, join forces to attempt to escape.

Even though the city of Tasceron and its emperor have fallen, when Master Galen and his sixteen-year-old apprentice Raffi hear a rumor that the heiress to the throne still lives, they must try to find her and keep her safe.

Their quest to find a secret relic with great power leads Master Galen and his sixteen-year-old apprentice Raffi into the Pit of Maar and the deep evil world at the heart of the Watch.

In this modern day version of Perceval and the Holy Grail, a guilt-ridden British teenager leaves his mentally ill mother to live with his wealthy uncle and begins a journey of self-knowledge and redemption after being briefly transported to the Waste Land of Arthurian times.