Victor Berti is a young blind man, who lives with his sister Rosa in the Italian city of Milan. They are happy and contented with their lot, even though they are quite poor and have been orphans for many years, for haven't they a friend m Don, their faithful dog who can guide Victor through the gay cafés and boulevards, while he plays on his violin. But there is one care which clouds their complete happiness and that is the infatuation of Ricco, the Apache chief, for the pretty Rosa. One day while Victor and Don are off on their rounds, Rosa receives visit from the bandit Ricco, who boldly presses his suit. She repulses his advances and hearing the approach of the returning brother, he slinks out with threats of vengeance. Rosa bravely hides her trouble from her blind brother, but he instinctively notes her agitation and resolves never to leave her alone again. The outlaw is not to be so easily put off, however, and calling together some members of his band, he plans to seize the girl and carry her off by force. A few days later the men waylay the couple, seize and gag Rosa and spirit her off. Poor Victor, helpless to follow the villains and deserted even by Don, gropes his way homeward and there gives way to his grief. But there was reason in Don's desertion, for with almost human sagacity, he silently shadows the band of Apaches until they disappear into an abandoned house. Soon they return, having secreted Rosa within. Don circles the den and in the rear finds a way to climb to the shed roof and gains access into the room in which Rosa is confined. She manages to scribble a few lines on an old envelope, places the message in Don's mouth and bids the faithful dog carry it to the master. He gives the paper to Victor, whose friend reads the message of distress. With the aid of help, Victor's friend soon liberates Rosa.
—Moving Picture World synopsis