An engineer is wrongly convicted of selling secrets to enemy agents and is sentenced to life in prison. Convinced it was his former partner who framed him, he enlists his son to investigate.
| Actor | Role |
|---|---|
 Francis MatthewsJim Richards | Jim Richards |
 Jack GwillimJohn Richards | John Richards |
| JJill WilliamsSue Thompson | Sue Thompson |
 Basil DignamRalph Thompson | Ralph Thompson |
 Nyree Dawn PorterBetty Martin | Betty Martin |
| LLorraine ClewesMrs. Richards | Mrs. Richards |