Book excerpt: Policing remains one of the most controversial areas of criminal justice. Recent years have seen major changes in every aspect of policing: new constructions of the police mission, new ways of delivering police services and new arrangements for police accountability. The police have had to respond to international terrorism, international organized crime, the new faces of migration and asylum, globalization and the reconstitution of societies in the post-Communist and Islamic world. This completely revised second edition argues that through these changes enduring and fundamental divisions can be traced. The book is relevant to those studying criminology, police studies, sociology, social policy and law, wherever their interests touch on the police.