The Hidden Message (1914)

Wealthy rancher Bronson is targeted by a group of Mexicans who hate him. In an act of revenge, they kidnap his daughter, May, and demand a large ransom for her safe return. The abductors force May to write a letter to her father stating that she will be killed if he does not meet them at a specific location by midnight with a considerable sum of money. While her captors are momentarily off guard, May manages to secretly add a hidden message to the letter. Bronson and his allies then decipher the hidden message and rescue May in time to prevent her murder and avoid the ransom payment.