| CHARACTERS | |
|---|---|
| Admiral Sir Reginald Cooper, KCB, KCMG | Sixth Sea Lord |
| John Cooper, Sub-Lieut., RN | his son |
| Robert Maxwell | an inventor |
| Derek Sherwood | his nephew |
| Beale | his servant |
| Mr. Fugijiro | a Japanese gentleman |
| Hamilton, alias Lockyer | his man |
| Takihama | his servant |
| Inspector Dodd | of Scotland Yard |
| A Policeman | |
| Miss Gaskell | Mr. Maxwell’s Secretary |