The Adventurous Soul (1927)

The owner of a shipping company arranges to have his worthless son, Glenn Martin, shanghaied and treated roughly on one of his ships, skippered by the hard Captain Svenson. The son learns of the plan and escapes, while clerk Dick Barlow, betrothed to Glenn's sister, Miriam, is taken instead. The clerk makes good under Glenn's name, until a visit by Miriam reveals Dick's true identity.