Following a narrow escape from death, Julien finds himself in a tiny hamlet in the remote part of the Pyrenees mountains. He doesn't realize it, but he's closer than he's ever been to his goal of finding the Holy Grail!
Meanwhile, Julien himself is being sought by none other than the Duke of Lorraine's banished daughter, Isabelle! Isabelle is a powerful sorceress with nothing left to lose, a free agent, her motives unclear. Isabelle follows Julien's tracks to Rennes-le-Chateau, where a deadly nighttime encounter yields a tantalizing clue about the truth of her family history.
And the Duke of Lorraine's fortunes continue to rise, to the point where he can openly defy the Church. But as his power grows, his grip on sanity weakens...