A good reason to retain control of your covers.
The background idea is that at this point in history, there are no longer any biological creatures. Everyone, regardless of degree of sentience, is a robot/created being. Against this very interesting backdrop, Stross sets a fast-paced potboiler-y tale of intrigue, not-knowing, double-dealing, and sisters who are not sisters. It's fun (including the homage a everyone in SF), though the worldbuilding is ultimately more interesting than the plot.