Edogawa Rampo's "The Fiend with Twenty Faces" is now in print, thanks to translator Dan Luffey.
Edogawa Rampo has a well-deserved reputation for ero-guro literature, but this was written for schoolboys in an age when schoolboys were still considered nice and naive. The good guys are real good, and the bad guys not all that bad, and the plot is pure Rampo.
Enjoy!