"The Yellow Door"

I'm going to let John Olsen give you an a taste of what this novel is all about.

 " Just what is the Yellow Door? Is it a real door? Or is it a hidden password? Or is it a secret society? The Shadow discovers that it is all three. And only The Shadow can defeat the sinister organization reaping millions in illegal wealth.

  And just what is behind The Yellow Door? Members who are privileged to pass through this strange yellow door set in a purple room, will encounter "golden walls that hear" and "jeweled panels whose gems are seeing eyes." And power... Power lies behind The Yellow Door. If you want to know more, you'll just have to read the story for yourself! You won't regret it."

  The cover is a real keeper, except for that book in the lower left corner.  Seems like a bad design decision to me.  Oh well, it's still an exciting scene of our hero in terrible peril.  How would he get out of it?  I guess you had to read the story to find out.