The book reads like click bait.
The real meat of the story surrounding what was going on at Cambridge Analytica (loopholes allowed access to personal data, AI and psychology combine to create effective social engineering, rich people abuse this for elections), is sporadically littered about a dull and egocentric narrative touting the thrill of a young misfit on the cutting edge of data science.
There are some interesting details regarding some specific company operations, and a take or two from the author that were somewhat enriching. However, a look through the Wikipedia page, and a few Google searches on the matter will likely get you the same info without the hundreds of transnational name drops, ugly and ineffective fashion parallels, and chapters full of immature commentary reminiscent of someone who just discovered billionaire politicians are bad.
Props to the author for blowing the whistle. I can't share the same enthusiasm for penning this book, as it feels like a quest for validation (and probably $$$), and less a service to the millions of people whose lives were severely impacted by the legacy left behind by Cambridge Analytica.