- Unknown:
- Ursula Bloom
- Noel Blair, an officer in a cargo boat:
- Hedley Goodall
- Hugo Blair, his father:
- Charles Spencer
- Marguerite Blair, his mother:
- Pauline Vilda
- Lieutenant Richard Grant, R N her lover:
- , Deering Wells
- Janet, the maid:
- Vivienne Chatterton
- Foxley, the mate:
- Terrence Duggan
- Graham, the second officer:
- William Eldridge