"While turning around, I catch a glimpse of a strange stain on the wall behind her.  It wasn't there before.  Or at least, I don't think it was.  As a matter of fact, I know it wasn't, because when we came in, I remember taking in the whole room."
Mr. Creeper's Chillers Volume One The Stain on the Wall.  What do you do when your imagination gets out of control?  Or is it something that you can't explain and no one else realizes is real?  Find out in The Stain On The Wall if the things you see and hear are real or just shadows and your mind is playing tricks on you.