The warrior’s apprentice is the second Vorkosigan book to be published, and is the first to star Miles Naismith Vorkosigan, hero of the majority of the series. Published shortly after Shards of honor, The warrior’s apprentice actually takes place about 17 years after the conclusion of Barrayar.
Brief plot description
(Possible indirect spoilers for Shards of Honor and Barrayar)
The warrior’s apprentice features Miles Naismith Vorkosigan, physically disabled but brilliant son of Cordelia Naismith and Aral Vorkosigan. After his physical handicaps prevent him from the military career he had always dreamed of, Miles travels to his mother’s homeworld of Beta Colony in an attempt to figure out what to do with his life.