Cork and Marriott assist the railway police in an investigation into a sensational mail robbery. Jenkins, the guard and an old-timer with 25 years' service, swears the lock was secure and the mail train was not held up. Railwayman Tom Pocock, recently dismissed for theft, seems the obvious suspect.
| Name | Type | Role | |
|---|---|---|---|
| Arthur Swinson | Writer | ||
| Josephine Douglas | Director |