On June 6, 2013, Britain’s Guardian newspaper published an explosive story revealing it had obtained official documents showing that the super-secret National Security Agency had been engaging in the “bulk collection” of phone bill records of millions of Americans. Three days later, in a video posted on the Guardian’s website, a 29-year-old employee of Booz Allen Hamilton, a firm contracted to provide tech support to the NSA, declared that he was the source of the documents. From a Hong Kong hotel room, Edward Joseph Snowden claimed the NSA was undermining privacy and democracy around the world. Snowden, already the subject of books, a documentary and a feature film, has been hailed as a hero. Epstein concedes that some of Snowden’s disclosures had positive results but contends that ultimately Snowden was no whistle-blower but was at the least a defector and, wittingly or unwittingly, even part of an elaborate Russian spy operation. (That seemed unlikely to start, and this week Obama commuted the prison sentence of former Army intelligence analyst Chelsea Manning for leaking military secrets but did not act on Snowden’s request.) The book is also timely given the Russian hacking of the Democratic National Committee and newly inaugurated President Trump’s controversial comments about both Russia and U.S.