FYI, The original Zorro novel, The Mark of Zorro by Johnston McCulley, came out in 1924.
The first novel keeps Zorro's true identity a mystery up until the big reveal at the end. It's an interesting choice, but the cat's out of the bag now.
There are five Zorro books by McCulley up on Amazon. I've only read the first one, which was a perfectly good adventure novel.