6'MIDST THE SCENE OF RED RUIN
40THE BOMBING EXPEDITION
7CHAPTER IX
41CHAPTER XXVI
8BETTY
42A FUTILE RESCUE
9CHAPTER X
43CHAPTER XXVII
10THE SEAPLANE'S QUEST
44FUGITIVES
11CHAPTER XI
45CHAPTER XXVIII
12THE TERRORS OF THE AIR
46TRACKED
13CHAPTER XII
47CHAPTER XXIX
14THE RAIDER'S RETURN
48GASSED
15CHAPTER XIII
49CHAPTER XXX
16EXIT SEAPLANE No. 445B
50THE BARN BY THE RIVER
17CHAPTER XIV
51CHAPTER XXXI
18BUTTERFLY
52THE FRONTIER
19CHAPTER XV
53CHAPTER XXXII
20RECALLED BY WIRE
54AN AVERTED CATASTROPHE
21CHAPTER XVI
55CHAPTER XXXIII
22CAPTIVES IN A SUBMARINE
56VON EITELWURMER'S OPPORTUNITY
23CHAPTER XVII
57CHAPTER XXXIV
24THE MIDDLE WATCH
58KIRKWOOD'S WINDFALL
25CHAPTER XVIII
59CHAPTER XXXV
26AN OCEAN DUEL
60ONE CARTRIDGE LEFT
27CHAPTER XIX
61CHAPTER XXXVI
28HELD UP IN THE NORTH SEA
62THE ELUSIVE OBJECTIVE
29CHAPTER XX
63CHAPTER XXXVII
30INVESTIGATIONS
64"THE GREAT STRAFE"
31CHAPTER XXI
65CHAPTER XXXVIII
32ON THE TRAIL
66SNATCHED FROM HER PURSUERS
33CHAPTER XXII
67CHAPTER XXXIX
34THE STRUGGLE ON THE CLIFFS
68AND LAST