Barrayar

Barrayar won the prestigious Hugo Award for Best Novel in 1992. It shared this distinction within the series with Bujold's later novel, Mirror Dance. It was also nominated for the Locus Award for Best Science Fiction Novel the same year.

The plot revolves around an assassination attempt on his mother, Cordelia Vorkosigan, using a soltoxin poison gas. The emergency medical treatment required to save the pregnancy severely damaged the fetus. Miles is born with extremely fragile bones that break easily, stunting his growth.

Yes, Barrayar is the 1991 sequel that directly continues the story of Cordelia Naismith and Aral Vorkosigan immediately following their marriage at the end of Shards of Honour. It bridges the gap between their initial meeting and the birth of their son, Miles. Together, the two books detail the early foundations of the Vorkosigan saga.

The primary antagonist is Vidal Vordarian, a conservative Count who launches a violent coup to overthrow Emperor Gregor and seize power. The conflict forces Cordelia to take command and utilize her Betan training to rescue the young Emperor and stop the civil war. Vordarian's claim to the Imperium drives the novel's climax.