Ed Snowden has published a book of his memoirs: Permanent Record. I have not read it yet, but I want to point you all towards two pieces of writing about the book. The first is an excellent review of the book and Snowden in general by SF writer and essayist Jonathan Lethem, who helped make a short film about Snowden in 2014. The second is an essay looking back at the Snowden revelations and what they mean. Both are worth reading.
As to the book, there are lots of other reviews.
The US government has sued to seize Snowden’s royalties from book sales.
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