In this breathless thriller, the unforgettable Billy Yamamoto and his inherited team of local cops confront child abuse, professional negligence, and racial intolerance as they investigate connections between a dead boy and numerous "solid" citizens. Occult activities, drugs, and secret teenage pacts intersect with the world of loan sharks and smugglers as a small-town murder crosses the border and threatens to become an international incident—and then another body is found.

London: the early 1840s. The birth of the young Queen Victoria’s first child is taken as an auspicious sign for all. But on a cold March night, a spree of dark crimes in shadowy workhouses shocks the city. When Inspector Owen Endersby, of the recently formed London Detective Police, learns that the string of identical murders and abductions have all taken place under similar circumstances, he fears a monster is prowling the city. How long until the murderer strikes again? Is this the work of a diabolical killer, of a madman with confused motives? Facts are scarce. Endersby and his sergeant, Thomas Caldwell, must start an investigation based on the fitful testimonies of terrified girls and one peculiar clue: a piece of curtain lace found in the throats of the victims.

In 1840, the theatre world in London is shocked by the brutal killing of one of its youngest and most successful entrepreneurs, bludgeoned in his house. The discovery of a contentious theatre contract, a collection of promissory notes and a walking stick, its bloodied ivory head in the shape of a dog, are the only leads. Inspector Owen Endersby, of the recently formed London Detective Police Force, is called upon to apprehend the culprit before Christmas Eve. The inspector has six days to chart the "by-ways of the Criminal Mentality." The case soon involves street vendors, downstairs servants, money lenders and the greatest performers of the stage. Who had motive to batter the young man to death? Without the techniques of the modern-day detective, Inspector Endersby must root out the villain any way he can—by disguise, break-and-enter, bribery, mail tampering and physical force.