The Boy, involved in a maritime disaster as a child, suffers from hydrophobia. He invents a life preserver that automatically inflates when it hits the water, using it to save the life of Rose Ryan, the daughter of a steamship magnate.
| Actor | Role |
|---|---|
 Monty BanksThe Boy | The Boy |
 Robert EdesonJames P. Ryan | James P. Ryan |
 Anne CornwallRose Ryan | Rose Ryan |
 Stanhope WheatcroftGerald Deane | Gerald Deane |
 Glen CavenderDoublecrosser | Doublecrosser |
| DDonald MorelliBordanni | Bordanni |
 Syd CrossleyRyan's Butler | Ryan's Butler |
| RRuth HollyRyan's Secretary | Ryan's Secretary |
| MMartha FranklinThe Mother | The Mother |
| JJack HuffThe Child | The Child |