Spoilery stuff below, but since I fully recommend you do NOT read this book, feel free to keep going.
Why do I do this to myself? I get into a horrible book and then feel like I have to complete it. It's the reading equivalent of "finish everything on your plate!" Even worse, I do it and then turn around and ask, every time, "Why do I do this to myself?" You'd think I would learn. Ugh.
For the record, I only read book one. It was enough. I got to a point where I got frustrated with Frankie being a doormat for her cousins, or rather, even more frustrated, because it was annoying from page one. I thought, "Why does she let herself be treated like an idiot?" Which was quickly followed by, "Why am I letting myself be treated like an idiot?"
For example, Louis, our Hero, is somehow the only policeman able to understand what is really happening, and also more bumbling than a Keystone Cop. He frequently forgets that he's a policeman, and that he's allowed, some might even say encouraged to gather evidence. Say, like jewelry that's been stolen. At one point he thinks to himself that he'd love to be able to search Euphemia's room for the jewelry. She has outright admitted to the crime by then, and told him that the jewelry is in her room. That's enough for a search warrant. Not to mention that to prosecute her, they need the jewelry for evidence in court. One could argue gross negligence on Louis' part for not getting a search warrant. Furthermore, he forgets that he has eyewitness testimony against several people who get away free at the end of book one. Testimony that could easily be corroborated with evidence that is just laying around waiting to be picked up.
I'm by no means a law expert. I'm no more versed in this than any TV watching person, but even I know better than our dear officer. Please, Ms. Westlake, stop insulting my intelligence.
Others here have noted that this shifter world isn't anything like other general shifter tropes, and not in a good way. Also, if you are looking for romance, you can skip all the way to the last chapter. It's like it was tacked on when someone reminded the author that there was supposed to be some. And even then it's 'fade to black' in the weirdest way. Makes me wonder why they even bothered.
I could go on, but I have better ways to spend my time. Don't read this book series. You have better ways to spend your time, too.