Following the extinction of humankind in the twenty-third century, leaving behind only androids, femmebot Freya Nakamichi 47 accepts a job to transport a mysterious package from Mercury to Mars, unaware that some extremely powerful and ruthless humanoids will stop at nothing to possess the package and its contents.

Krina Alizond is a metahuman in a universe where the last natural humans became extinct five thousand years ago. When her sister goes missing she embarks on a daring voyage across the star systems to find her, travelling to her last known location - the mysterious water-world of Shin-Tethys. In a universe with no faster-than-light travel that's a dangerous journey, made all the more perilous by the arrival of an assassin on Krina's tail, by the 'privateers' chasing her sister's life insurance policy and by growing signs that the disappearance is linked to one of the biggest financial scams in the known universe. This is set in the same universe as Saturn's Children, 5000 years later.