该片披露了美国“棱镜”项目曝光者斯诺登从香港前往莫斯科的诸多细节，包括他在香港与卫报记者会面的过程。 纪录片导演介绍，该片披露了美国“棱镜”项目曝光者斯诺登从香港前往莫斯科的诸多细节，包括他在香港与卫报记者会面的过程。 当时，他们接头的暗号之一，是斯诺登手里的魔方。纪录片通过情景再现的方式向观众介绍了许多不为人知的细节，曾为斯诺登提供过帮助的关键人物首次详细披露整个过程。影片内的受访对象包括美国前国家安全局局长迈克尔海登，维基解密创始人朱利安·阿桑奇等，也包括斯诺登的父亲。

Ai Weiwei, famous for his large-scale installation work and his dogged social justice advocacy, created a career-defining work in 2015 with @Large, mounted at Alcatraz, the emblematic site associated with egregious incarceration conditions and radical Native American protest. At the core of @Large were portraits of prisoners of conscience coupled with the opportunity to write letters of solidarity to the imprisoned. In her impassioned and powerful film, exhibition curator Cheryl Haines visits several current and former prisoners, including American whistleblower Chelsea Manning, and learns how these letters were vital to their survival. “The misconception of totalitarianism is that freedom can be imprisoned. This is not the case. When you constrain freedom, freedom will take flight and land on a windowsill.” — Ai Weiwei