"Soviet Communism: from Reform to Collapse" is a very good compilation of primary and secondary literature discussing the Gorbachev-era attempts at reform and the beliefs held by the spearheads of the movement; and it is an equally good compilation of the failures (or unintended outcomes) of the reforms that contributed to the USSR's eventual downfall.
The literature is broken down into five general sections:
1. Background
2. Perestroika
3. Democratization and Crisis
4. Disintegration
5. Reflections
Although you gain a great deal of insight into the ideas, events, and documents that drove the USSR's collapse, this book isn't so much of a history in retrospect with source notes to applicable literature or archives. Hence, Davies's book better serves as a compendium of articles, CPSU documents, and analyses as events transpired.
The authors involved are vast in terms of occupation, status, location, and ideological affinity. Therefore, part of what I appreciate is the range of opinion and interpretation; so if you are searching for a book that does not contain a specific agenda and has balanced coverage, then this will be a great addition to your library. That being said, I was a bit surprised to not see Aleksandr Yakovlev among the list of authors given the massive role he played in ideological disillusionment, and given his position in the CPSU in general. I could make a case for Aleksandr Solzhenitsyn, as well - maybe Davies doesn't like the name Aleksandr lol (although there is one Aleksander in here, to be fair) - but I believe his impact was greatest during the mid-70s when "The Gulag Archipelago" was published.
I was pleased with the range of topics covered, too, as you obtain both context to the reforms, the intentions and nature of the reforms passed, their impacts on Soviet politics, economy, society, etc., and a look into the USSR post-collapse. One of my personal reservations was the lack of coverage on Glasnost, comprised of a single article by Walter Lacquer. It wouldn't have hurt to add one or two more articles to gain a wider range of interpretation, in my opinion.
The couple of limitations aside, this was a fantastic introduction and companion to other books on a massive historical epoch. 5 stars.