Barrayar

As Barrayar begins, Aral and Cordelia Vorkosigan are expecting their first child. When the crafty old emperor dies, Aral takes over as regent. A plot to assassinate Aral and Cordelia with poison gas fails, but the antidote, while effective, is also a powerful teratogen that poses a grave threat to the bone development of his unborn son. In a desperate attempt to save the fetus, Cordelia has it transferred to a uterine replicator to undergo an experimental recalcification treatment that may partially combat the otherwise-fatal bone damage.When Count Vidal Vordarian attempts a coup, five-year-old Emperor Gregor is rescued by his loyal security chief, Captain Negri, and reunited with the Vorkosigans. Cordelia, Gregor, and various retainers escape into the hills and hide amongst the rural population while Aral and his father organize the resistance.