I was enjoying up until about episode 3. But I think it's become a bit ridiculous and unauthentic.
Firstly, I don't find Nicholas character very realistic. He is acting like a teen who has gone through serious 'A grade' childhood trauma and seems to have absolutely no normal affection for his parents at all. I know it's seemingly down to him taking drugs, but even his parents very average dysfunction didn't seem quite big enough a trauma to cause such a massive apathy in his character. Even the squalid drug den seemed like what an author wants a stereotypical drug den to look like. It's like something from the 90s.
A dysfunctional and stoned Nicholas wouldn't have sustained attention or interest in reading a whole book by a stranger. That was unbelievable. His texting a random boy, about backpacking around the world was also unbelievable, and his subsequent total emotional breakdown because he's told someone died trying to save his life as a child and his mum shagged a stranger was also overly dramatic and unrealistic imo. Someone that apathetic wouldn't give a shit imo.
Everyone suddenly turning against Catherine seemed again totally implausible. EVERYONE in her workplace taking the word of a complete stranger who has provided no proof other than his turn of events? No. And in these days of HR red tape, what manager would have confronted Catherine (considering also her status) in front of the entire staff?
Her husband actually meeting SBC in person (!) begging clemency and throwing her under the bus so easily, again, I felt, unrealistic. Throwing her out due to deep resentment, was a bit believable. Barely.
I have no idea how reflective the series is of the book, but I feel the author should have done more research or developed her ideas better. The events aren't quite making sense. But maybe everything will resolve itself with further episodes.