The Edogawa Rampo reader is like a beginner's guide to the man credited with bringing in the Golden Age of crime and mystery fiction in Japan. It contains not only some stellar examples of his ficton work, but also an array of essays that let us get into the mind of the man a little bit.
I found the short stories mostly interesting, though I wonder if something wasn't lost in translation sincec the language sometimes felt a bit clunky. Still, each one kept me reading and left me excited for the next.
But the real gem here for me were the essays. He talks a lot about optics and the sense of unreality or too-much reality they can give - from microscopes to movies. And the play of optics does seem to be a recurring theme in a lot of his more horror-themed stuff. Also, his essay on tricks in mystery fiction reads like a primer to how the mysteries in Detective Conan are formed. :)
If you've ever been interested, this is a great place to start.