Overall, very good
Overall, I've enjoyed what I've read in the first 8 chapters. The plot for me is certainly a big draw in as it's very different from the typical themes of fantasy/supernatural plots. The characters seem pretty interesting as well, and I do enjoy Mason's wit and humor most of all.
Read the story now
In terms of readability, the chapters are short and sweet which is mostly a good thing. Some books do require longer chapters while some veer better with shorter ones. All I will suggest in terms of this is focus a little more on the narrative text (the storytelling). Describe how they feel, the room they're in, their emotions, their looks, etc between the spoken and thoughtful dialogue. You never have to give too much, but it really helps the reader immerse themselves in the book.
Another small tip, sentence structures could do with a little reworking. Some of them come across a little staggered, so see if you can make them flow a little more =) Also avoid using things such as 'like, literally, everything was black'. This could be better written, 'there was not a sign of color amongst the clothing that was blacker than the night sky'. Just as an example.
Overall though, you're doing great with it and I strongly encourage you to continue with the book and I look forward to seeing the plot unfold! I love that it's different and how you've given each of them their own sense of mystery and personalities. A big thumbs up from me!