Shannach - The Last by Leigh Douglass Brackett audiobook.
A true pulp science fiction from 1952 from the pen of Leigh Douglas Brackett. In the deep caves of Mars an alien race ruled and enslaved men and women with cruel and unfeeling desires. This was about the challenged by one weak man. He knew what he had to do and would die trying to do it. The question is, was he hurting or helping them? A cryptic summary because this is a cryptic story. What looks like a simple straightforward plot has layers of deception and subtle humor. Was he destroying the aliens, or were they just using him? Listen and find out.