Book excerpt: While the City Sleeps is an extraordinary work of scholarship from one of Argentina’s leading historians of modern Buenos Aires society and culture. In the late nineteenth century, the city saw a massive population boom and large-scale urban development. With these changes came rampant crime, a chaotic environment in the streets, and intense class conflict. In response, the state expanded institutions that were intended to bring about social order and control. Lila Caimari mines both police records and true crime reporting to bring to life the underworld pistoleros, the policemen who fought them, and the crime journalists who brought the conflicts to light. In the process, she crafts a new portrait of the rise of one of the world’s greatest cities.