I made a thread about it but 100% The Oligarchs: Wealth and Power in the New Russia is 5/5. It starts by giving the reader a general overview of the USSR in the late 80s and its decay, and then it goes on to dedicate a chapter to each of the 7 featured Oligarchs' life in the USSR. The second half of the book discusses the 90s and all of the shady and reprehensible dealings by the Oligarchs. Klebnikov's Godfather of the Kremlin is another good read, although it focuses more on Berezovsky himself while still giving an overview of the situation in the 90s.
Remnick's Lenin's Tomb covers the fall of the USSR exclusively, and for better and worse, it is a type of gonzo journalism in the sense that the story is told through the author's experiences with Soviet citizens (which then are tied back to the general narrative of the decay that was ongoing). It was interesting to read of his experiences as he went just about everywhere in the Union. So it isn't just focused on Moscow, but there are a few chapters about his time in Kazakhstan, Tajikistan and so on. Overall, it was fairly good but I would like something a bit more objective. Unfortunately, I haven't really been able to find anything that fits that criteria.
It's funny you mention it because I'm having trouble with the old testament as well. It's hard for me to really get into it. On the other hand, on Christmas I read through the Gospel of Matthew, and it really grabbed me. I know that I will enjoy the New Testament a lot more, but I feel as though I need to get through the OT in order to have the appropriate context.