There are several detailed reviews available of Freezing Order, and I'm not going to swell the rout of eight-paragraph analyses of Bill Browder's book here. Suffice it to say that Browder explains in plain language in this book and his earlier Red Notice why the Russian regime under Putin is an organized crime syndicate masquerading as a government, and he describes how Western banking and legal institutions have wittingly and unwittingly aided Putin's, and the oligarch's, accumulation of wealth. Most of their money has ended up in banks or real estate in Switzerland, the UK, the US, and other Western "rule of law" nations, and the total amount moved is in the neighborhood of $1 trillion, with about 20% of that belonging to Putin himself.
Finally, the war in Ukraine has woken most people up to what a monster Putin is, but the only way to make him and his cronies suffer for their crimes is to make them as poor as possible by shutting them out of Western financial systems, seizing their assets, and stopping them from using the West as their playground. The Magnitsky Act in the US that Bill Browder worked so long to get passed into law and similar laws in Canada, the EU, the UK, and Australia (with similar bills pending in several countries) finally gives national justice / law enforcement agencies the tools they need to seize assets and prosecute criminals. At least four people Browder knew and worked with on exposing human rights abuses and financial crimes were killed by Russian state security agencies, and two others were nearly killed or maimed. Browder himself has been repeatedly targeted by the Russians, and he has been tried twice in absentia and convicted of false charges in Russia. He has had to keep bodyguards around him whenever he was in a location where the Russians operate relatively freely, and he has had to flee certain countries, like Monaco and Spain, where the FSB has a cozy working relationship with local authorities.
The thing that having $200B does for Putin is that it is easy to buy officials in many countries who will either do his bidding or turn a blind eye to his crimes. In some manner, Trump was one of these. It is not clear whether Putin "loaned" Donald the money to build his golf course in Scotland, or if there was some other form of Kompromat on Trump, but Trump's behavior in favoring Putin fits the model of other officials over whom Putin has or had leverage, like Congressman Dana Rohrabacher (who should definitely be investigated, by the way). In the infamous Helsinki meeting with Putin, Trump described Putin's proposal to trade 12 GRU agents for Bill Browder as an "incredible offer"; and Trump for days refused to reject it, but fortunately Putin over-played his hand by then also asking for the former US ambassador to Russia to be handed over, and ultimately the outcry from real Americans forced Trump to politely turn down his pal Vladimir's offer.
This is an excellent book, and a quick read, and I also highly recommend Broder's previous Red Notice, which explains the rise of Putin. Freezing Order brings the story up to date from 2015 when the previous book was published.