The second edition of Secret Intelligence: A Reader brings together key essays from the field of intelligence studies, blending classic works on concepts and approaches with more recent essays dealing with current issues and ongoing debates about the future of intelligence.Secret intelligence has never enjoyed a higher pro?le. The events of 911, the con?icts in Iraq and Afghanistan, the missing WMD controversy, public debates over prisoner interrogation, together with the revelations of figures such as Edward Snowden, recent cyber attacks and the rise of 'hybrid warfare' have all contributed to make this a ‘hot’ subject over the past two decades.