4 stars!!! 
 I thought this was quite a good YA dystopian novel to be honest. The world that Katharine McGee created was very immersive. The worldbuilding was pretty phenomenal. There are all these descriptions of the technological advances and the systems in place. Everything is highly furturistic. I really wonder how it would be like if such a building existed in real life. That would be so awesome and I'm sure I'd love to live there. Can you imagine having a whole city in a building? Wow! :D 
 The story has a very "Gossip girl" vibe mixed with PLL. I haven't watched much of Gossip Girl but PLL is a guilty pleasure of mine XD. The story follows 5 POVs. The highlier kids live on the top floors while the poorer ones live below. The plot of the story revolves around the lives of these 5 MCs and how they navigate their social circles. 
 First, we have Avery. She is the richest of all our MCs. She lives on the 1000th floor. I personally did not like her character much. I found Avery very annoying. It's like everything needs to revolve around her and don't get me started on her relationship with Atlas. That was just nauseating :/ 
 The second is Eris. She comes from old money but her life takes a drastic turn for the worse in the book. I really liked Eris and felt her personality really developed as the story progresses. She might come across as haughty at first but she does have many layers. 
 Leda is a recovering addict and back from her stint in rehab. She is one of Avery's best friends but is having a difficult time sticking to the straight and arrow. Will she relapse into her old ways? 
 Rhylin and Watt are both "downTowers". Rhylin and her sister Chrissa are trying to avoid the foster system. She likes to party a lot but we see some major changes happen in her life. While Watt is a hacker and has built an illegal quant computer. She and Watt are my favorite characters. We really get to see how they both struggle yet manage to try and make their lives better. 
 There are a couple of romantic interactions introduced over the course of the story. Some of them really pull at your heartstrings while others not so much. The story involves a lot of manipulation, betrayal, secrets and so on. There are pretty big reveals and twists which caught me off guard. The story also involves drug addiction, swearing and sex (though not graphic). So, I would say this book is definitely aimed at an audience of 16+. 
 If you like "Gossip Girl", you will love this story. I most certainly did. The book just sucks you in. Yes, it takes time to adjust to the POV shifts and the introduction of new minor characters, but the story is worth it. It keeps you guessing. I would definitely recommend this novel if you love YA dystopia. It's worth a visit :)