"Flawless Façade" is one book that carries the potential for quite the story. It's dark, brooding, and the sexual tension between characters such as Reece and Elizabeth can keep the reader interested. It's stories like this where it is imperative the author doesn't forget about the murder and the clues during the investigations that will eventually lead to the climax and drift off towards more of the romance side of things, so I really did like how, while not completely cutting out that sexual undertones of some dialogue between the characters, the main plot is mostly focused on the murder and the drama. Instead, any past romance is used as a way of tying together loose ends of the mystery.
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Now, the grammar is something that I find quite distracting. As I've mentioned, the dialogue needs proper quotations, including flashbacks. You should only be using singular quotation marks when a character is quoting something. There are times as well when I would find a character would start their dialogue within the same paragraph of dialogue as another, and while that is a simple fix, it becomes quite confusing for the reader.
During the prologue and first chapters (mostly) there are times where descriptions will be used as roundabout ways of explaining a situations. Imagery, similes, and metaphors are lovely, but when it becomes too much, the reader loses focus as to what is really going on. For stories such as this, being more direct paired with the serious tone of the topic makes it easier for the reader to follow, especially since this is a story told through third person point of view. The way it is set up at times makes it seem more like it's being told through first person when it's not.
Now, I do like the characters, Reece especially. They are diverse with their own personalities and all add a bit to the plot. Now, I would point out Elizabeth is a character that I can't quite understand due to her having no relatability. Yes, she has lost someone dear to her as we all have, but being superb in both combat and intelligence makes her seem too out of place from the realism in which the rest of the characters display, almost otherworldly.
The shifts in time and setting are also a bit off for me. The story goes slow at some points, usually when characters are conversing, and then speeds up so fast that it's as if the characters have all teleported. The pace of the plot is inconsistent and I would recommend slowing it down in general without putting in too much detail where it isn't neccessary. It would make the chapters longer and what is going on more clear, so you would only need to use imagery to tell what is happening and less by means of comparison.
Other than this, the plot of the story is one I am in love with and I do hope you update soon. I don't want you to think my words are to say your book isn't good, it's quite the opposite, actually. I just want you to be able to make your book the best it can be, because, as a writer, you have a story to tell, and a brilliant one it is!