I'll start with the good points. The Author has a lot of potential to have an amazing story. The plot is interesting and makes you wonder who the killer really is. The descriptions are quite good at times, that being said some of the word choices, a few spots of bad grammar, and the chapter structures make it difficult to stay invested. It is by no means unreadable, it's truly good, I can just see that this author cares and could make it absolutely perfect.
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For me, I have trouble with some of the cop cliches that are shown in the book, holstering your gun by squeezing it in the Hem of your pants isn't good, a cop not having their guns locked away, making a phone call to say one sentence and not even say hello or goodbye, they only focus on this one lead (I get one of the cops focusing the primary lead but there would be other suspects they would meet and have to look into. This could really add an entire other level to getting to know Xavier through the accounts of others), the fact they meet the suspect and then immediately go drinking... All of these things could be edited to add more to the story and more suspense.
And finally I am not a fan of specifying the perspective at the beginning of each chapter, the quotes, and the authors notes at the end. If you're perspective is clear, there is no need to specify. As well as I view it as if it were truly a printed novel, next to none have those things.
Overall, the author is amazing and I hope they continue to push themselves and continue to make such a great story. ❤️