L'Opéra du Diable Series by Hervé Jubert

In London, Jack the Ripper has claimed another victim.But this "London" is a crime-free virtual city, a historical theme park for tourists. Qualified witch Roberta Morgenstern and her young police assistant, Clément Martineau, set out to solve the murder.A wild chase through the streets of old London brings them face-to-face with the terrifying new Ripper. But then they realize their true quarry is the man behind the monster: the one bringing history's most notorious villains back to life... moreIn London, Jack the Ripper has claimed another victim.But this "London" is a crime-free virtual city, a historical theme park for tourists. Qualified witch Roberta Morgenstern and her young police assistant, Clément Martineau, set out to solve the murder.A wild chase through the streets of old London brings them face-to-face with the terrifying new Ripper. But then they realize their true quarry is the man behind the monster: the one bringing history's most notorious villains back to life. The trail of evidence leads them from Louis XIV's Versailles through Renaissance Venice to Montezuma's Mexico, where they have a date with the devil himself. less

A mysterious killer strikes in a city where crime should be impossible.For generations, police investigations have been unnecessary in the city of Basle. Tiny tracers identify any criminal as soon as an illegal action takes place, and this has made the city virtually crime-free.But now the city is torn apart by a series of gruesome murders committed by a shadowy figure known only as the Baron of the Mists... moreA mysterious killer strikes in a city where crime should be impossible.For generations, police investigations have been unnecessary in the city of Basle. Tiny tracers identify any criminal as soon as an illegal action takes place, and this has made the city virtually crime-free.But now the city is torn apart by a series of gruesome murders committed by a shadowy figure known only as the Baron of the Mists. And qualified witch and detective Roberta Morgenstern and her young associate Clément Martineau are on the killer's trail.High-speed chases across rooftops and through the city's winding streets lead Roberta and Clément to the Queen of the Gypsies, the pirates of the lagoon, the practicers of some very dark alchemy, and finally to the deadly Baron of the Mists himself. . . . less