6CHAPTER V. RAN AWAY WITH AN AUTOMOBILE.
30CHAPTER XXIX. SAVED THE DAY!
7CHAPTER VI. DEATH RIDE OF AN AVIATOR.
31CHAPTER XXX. SETTING OUT FOR THE SEA.
8CHAPTER VII. ALONE ON A STRANGE COAST.
32CHAPTER XXXI. LIKE A MIRACLE OF OLD.
9CHAPTER VIII. ONE DARK NIGHT IN YPRES.
33CHAPTER XXXII. LIKE A DREAM OF GOOD LUCK.
10CHAPTER IX. TESTING BILLY’S NERVE.
34CHAPTER XXXIII. THE SEALED PACKET.
11CHAPTER X. ON THE ROAD TO ROULERS.
35CHAPTER XXXIV. AT THE FRONT DOOR OF PARIS.
12CHAPTER XI. THEY MEET A GENERAL.
36CHAPTER XXXV. THE FLIGHT UP THE SEINE.
13CHAPTER XII. WITH THE BRITISH ARMY.
37CHAPTER XXXVI. THE WAY THAT WENT WRONG.
14CHAPTER XIII. THE BOYS UNDER FIRE.
38CHAPTER XXXVII. OUT OF A SPIDER’S WEB.
15CHAPTER XIV. IN AN ARMORED MOTOR CAR.
39CHAPTER XXXVIII. THE FORTUNE DELIVERED.
16CHAPTER XV. FAREWELL TO FRANCOIS.
40CHAPTER XXXIX. THE CALL OF THE AIR.
17CHAPTER XVI. THE VALLEY OF THE MEUSE.
41CHAPTER XL. CAPTURED BY THE GERMANS.
18CHAPTER XVII. THE POINT OF ROCKS.
42CHAPTER XLI. THE BOYS PUT ON THE GRAY.
19CHAPTER XVIII. AT THE MOUTH OF THE TUNNEL.
43CHAPTER XLII. FOUGHT TO THE FINISH.
20CHAPTER XIX. THROUGH THE SECRET PASSAGE.
44CHAPTER XLIII. SETTING OF A DEATH TRAP.
21CHAPTER XX. BEHIND CHÂTEAU PANELS.
45CHAPTER XLIV. A LIFE IN THE BALANCE.
22CHAPTER XXI. HENRI FINDS THE KEY.
46CHAPTER XLV. THE WAYS OF THE SECRET SERVICE.
23CHAPTER XXII. THE FORTUNE OF THE TROUVILLES.
47CHAPTER XLVI. THE FACE IN THE MIRROR.
24CHAPTER XXIII. TRAILED BY A CHASSEUR.
48CHAPTER XLVII. THE MYSTERIOUS MESSAGE.
