"This excellent survey by two leaders in the field is essential reading for anyone who wishes to understand intelligence, secrecy and surveillance, together with its linkage to issues of democratic rights and civil liberties."—Richard J. Aldrich, University of Warwick"Peter Gill and Mark Phythian capture an increasingly vibrant field in way that is both sophisticated and accessible. This third edition engages with the latest theoretical and policy debates on intelligence based on contemporary and diverse cases."—Damien Van Puyvelde, University of Glasgow