PART III
| IX. | [Out in the North Sea. Preparing for Action ] | 145 |
| X. | [The Spear of Foam ] | 154 |
| XI. | [The Submarine Fights for England ] | 164 |
| XII. | The last Chapter—in two parts— | |
| [Doris and Marjorie have a late Visitor ] | 177 | |
| [Return of the Seven Heroes ] | 184 |
