ï»Snowdens identity as the source of the documents was still unknown to the public. But through a "net-connected device" he installed at his now-abandoned home in Hawaii to watch out for the watchers — presumably an IP surveillance camera with microphone — he knew when two people from the NSA showed up at the house looking for him, an NSA "police officer" and someone from human resources.

This is one of the new details revealed in No Place to Hide, the much-anticipated book by journalist Glenn Greenwald, who worked with Snowden and documentary filmmaker Laura Poitras to publish a number of blockbuster stories about the NSA.