Where are the old mystery books?

Hi,
I am enjoying the DailyLit system tremendously. I even changed reading an e-book I was reading to the DailyLit installments of it.
But I am missing most of the old mystery / detective books, the basis of the modern detective stories.
There was Fergus Hume ("The Mystery of a Hansome Cab" and many others).
And how about Anna Katherine Green ("The Leavenworth Case", "The Mystery of the hasty Arrow" and many others? She was an inspiration source for Agatha Christie, it seems.
You have two books by Wilkie Collins already. It would not harm DailyLit to get more of this great writer and friend of Dickens.
All the books mentioned are available at Gutenberg and free from copyright.
How about more books in this direction?

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