A doctor becomes the victim of extortionists when one of his patients dies under questionable circumstances.
| Actor | Role |
|---|---|
 Donald HoustonDr. Alex Waring | Dr. Alex Waring |
 Adrienne CorriLaura Shelton | Laura Shelton |
 Lyndon BrookDr. Ian Breck | Dr. Ian Breck |
 Jean CadellHenrietta Stevens | Henrietta Stevens |
 Sydney TaflerDr. Hearne | Dr. Hearne |
 Mervyn JohnsMr. Waring | Mr. Waring |
 Marie NeyMatron Fiske | Matron Fiske |
 Ronald AdamMajor Tilling | Major Tilling |
 John WelshInspector Austen | Inspector Austen |
 Beatrice VarleyMrs. Waring | Mrs. Waring |
 Noel HoodSister Slater | Sister Slater |
 Frank ForsythAnaesthetist | Anaesthetist |
 Tom BowmanSurgeon | Surgeon |
| SSusan WesterbyMiss Jenner | Miss Jenner |
| BBetty ShaleGarsten | Garsten |