[Chapter XVI. The Valley of the Meuse.]

[Chapter XVII. The Point of Rocks.]

[Chapter XVIII. At the Mouth of the Tunnel.]

[Chapter XIX. Through the Secret Passage.]

[Chapter XX. Behind Château Panels.]

[Chapter XXI. Henri Finds the Key.]

[Chapter XXII. The Fortune of the Trouvilles.]

[Chapter XXIII. Trailed by a Chasseur.]

[Chapter XXIV. A Race for Life.]

[Chapter XXV. The Sergeant to the Rescue.]