In June of 2013, journalist Glenn Greenwald unveiled to the world that an American had leaked documents from a secretive U.S. defense agency, the National Security Agency. The leaker was a man named Edward Snowden, who had worked at the NSA for four years and was hired through a contractor.

The stories published by The Guardian revealed practices never before revealed publicly about the America's surveillance programs, such as a metadata collection program on Americans' phones and the revelation that the NSA may have spied on world leaders.

After Snowden fled the U.S. an international manhunt began and it captured the attention of the world. Snowden taped an on camera interview with Greenwald and colleague Laura Poitras to reveal himself to the world as a self-described "whistleblower."

Glenn Greenwald's new book “No Place to Hide,” describes the behind-the-scenes story of how the journalist and his colleague Ms. Poitras met Mr. Snowden and what took place after. Greenwald spoke to Anderson about the book.