He is a retired four-star general who has the distinction of being the only person to head both the NSA and CIA. In his new memoir, “Playing to the Edge,” Michael Hayden candidly reflects on his time at both agencies during the turbulent, post-9/11 war on terror. 

After revelations that the NSA has been secretly collecting metadata on the phone calls of millions of Americans, we speak with one of the members of President Obama's review group charged with advising him on possible reforms: University of Chicago law professor Geoffrey Stone. Read The Guardian's NSA Files: Decoded.

How Crime Went Online and the Cops Followed

We take a look at the new criminals of the internet age -- and the technology police use to catch them. Read an excerpt from The Internet Police: How Crime Went Online and the Cops Followed.