It’s really great for your first book! One thing I used to struggle with when I started writing was the structure of the plot- as long as you have the framework in mind, then the story will just flow. As for your story- I’m enjoying it quite a bit so far. The only thing is maybe flesh out the characters a little more, for instance, Drake. There was quite little I saw in the earlier chapters that hinted at his sudden change in personality.
And also, paragraphing and sentence structure could use some work.
Nevertheless, I like your style of writing, and the description is excellent!