This is the third book in the "Shira Calpurnia" series. Australian author Matthew Farrer once again brings his dazzling talent to bear on the "Shira Calpurnia" series. The fast-paced, intelligent action takes place in the great Imperial fortress system of Hydraphur, where Adeptus Arbites officer Shira Calpurnia enforces the law. Now, she is investigating the murder of a blind astropath - psychic humans who use their gifts to communicate across the vast reaches of the galaxy - and she fears that the killer will strike again.