Aimée Leduc, a stylish private investigator created by Cara Black, has been working cases in every administrative district of her city since the 1990s. Which city is it?

From Marilyn Stasio’s Crime column for the Book Review in 2010:

Way back when, in Cara Black’s first Aimée Leduc mystery, “Murder in the Marais,” the stylish sleuth put a young man in prison for burning down a synagogue and causing two deaths. The arsonist returns in Black’s 10th novel, “Murder in the Palais Royal” (Soho, $25), with an even uglier story to tell about that night — if someone doesn’t kill him first. Aimée is determined to hear that story and bring his accomplice to justice — if she isn’t undone by the look-alike impostor who put her partner in the hospital and is systematically destroying their computer security firm.