Leuprecht and McNorton offer the only systematic comparison of the world's most powerful intelligence alliance, colloquially known as the Five Eyes: the United States, the United Kingdom, Canada, Australia, and New Zealand. The book examines developments and mechanisms in holding each country's intelligence community accountable. The authors provide a useful and sufficiently detailed sketch of the ISA governance complexes in each country and discover several interesting trends as well as novel exceptions worthy of deeper exploration.