Barrayar

In the wake of interplanetary war, former commander Cordelia Naismith has deserted her own planet to marry the leader of the defeated enemy, Aral Vorkosigan. When a palace coup endangers the government, their lives, and her unborn son, Cordelia takes action to secure the safety of her new family and new home. Winner of both the Hugo Award for Best Novel and the Locus Award for Best Science Fiction Novel in 1992.