"Crossing the River Styx," by Kristine Kathryn Rusch, in Alfred Hitchcock's Mystery Magazine, November 2014.
Someone shouted, "Murder!" and the others ran as if their lives depended on it...
Well. That's an exciting way to start a story, isn't it?
The illustration clued me in to the fact that this takes place in the 1920s, which made me think we were in a Bonnie-and-Clyde scenario, but not quite. Edith is a proper young woman on her honeymoon and Frank has taken her to the Oregon Caves. That's where the extreme darkness comes in.
Now Edith has to find a way out of the cave by herself (crossing a creek known as, yes River Styx) and figure out whether she is in danger from the men who fought with her husband.
The other key viewpoint character is Albert, a mechanic employed by the Forest Service that runs the caves. They will both learn something about themselves before the night is over.
As usual, a very good story from Ms. Rusch.