1986’s The Warrior’s Apprentice was Lois McMaster Bujold’s first Miles Vorkosigan novel.
Miles was exposed to a lethal gas while still in the womb and his bones did not develop properly. They are short and brittle. He looks odd; he looks like a mutant, which is a bad thing to be on his native world of Barrayar. During Barrayar’s time of isolation from other human-settled worlds, mutants were killed at birth. Modern medicine has better answers, but hatred of muties (and of people who are visibly deformed or disabled) is still ingrained in Barrayaran custom.
Mile must deal with daunting physical limitations. What may be worse is the disdain and even hatred of his fellow Barrayarans, who see his very existence as an affront to all that is right and good.
Miles is an aristocrat; a period (or a lifetime) of military service is customary for Barrayaran aristocrats. Miles wants to be a soldier like his peers. He may lack physical prowess, but he has charm, brains, and cunning. Those sterling qualities are enough to take him to the top in the academic courses at the military academy … but don’t help him pass the final physical test. He breaks both legs on an obstacle course. There will be no Vor military career for Miles. What to do with the rest of his life?