These are available for purchase legally through major digital bookstores. Purchasing these ensures that translators, such as the acclaimed Dan
If you read Japanese, this is the ultimate destination. Search for "江戸川乱歩" to download the original Japanese text of almost everything he wrote as a clean, legal or text file.
Perhaps his most famous novel, The Black Lizard features a female crime boss who is also a cabaret owner. She kidnaps a beautiful heiress to add to her collection of "living dolls." This story blends campy theatrics with genuine horror. Public domain scans of the pre-war Japanese text are available, but the English translation by J. Keith Vincent (found in The Edogawa Rampo Reader ) is locked behind copyright. You will likely find rather than the full book legally free.
Some of his notable works include: