If you crossed Brackett's Mars with Nolan's Logan's Run, you might get something like this.
A Mars that has sort of gone full-circle, rather than a nearish future with remnants of ancient technology floating around, you have a far future scenario with this is being the case - but with interplanetary travel possible.
However, in this book rather than edit out the old chunk of the population, this time they have done it to the male half.
What's left is a Solar System that has fallen - the Mars is politically unsophisticated, with clans warring with each other like primitives. Technologically the advanced stuff seems to them to be magic, and strange creatures like monsters to give a definite science fantasy feel to the story.
One obvious professionally named warrior, and opponent in opposition over a kid rather out of the ordinary.
With, of course, plenty of appearances of odd out of the past.
3.5 out of 5