Charles Stross - Neptunes Brood

The year is AD 7000. The human species is extinct—for the fourth time—due to its fragile nature. Krina Alizond-114 is metahuman, descended from the robots that once served humanity. She’s on a journey to the water-world of Shin-Tethys to find her sister Ana. But her trip is interrupted when pirates capture her ship. Their leader, the enigmatic Count Rudi, suspects that there’s more to Krina’s search than meets the eye