Hollywood can keep a secret. The famed Platoon director has wrapped up production on his Edward Snowden biopic after a process worthy of an espionage thriller. To access the data-mining whistle-blower, Stone purchased the rights to a novel written by Snowden’s Russian lawyer — a former Putin campaigner. Snowden himself was initially uncomfortable with the project, butting heads with Stone over content control. And of course the project had a code name, “Sasha,” to conceal Snowden from the likes of the NSA before it hits U.S. cinemas on September 16.