Plot

Mary and her brother, survivors of a shipwreck, are constantly harassed by Black John, a thief and cruel descendant of a pirate. Black John has taken a strong liking to Mary and wants to marry her. Tarzan has befriended Mary and protected her and her brother from Black John’s friends who are cruel to them. As Tarzan could not read, he wasn’t aware that the papers he had been keeping were very important. Mary read some of the documents only to discovered that Tarzan is sole heir to the Greystoke estate. Tarzan’s uncle arrives to try to find his nephew but before he can, Black John shoots Tarzan, then hides Mary’s bother and Tarzan’s uncle in a cave. Black John poses as Lord Greystoke and plans to go to England with Mary as his bride.