To start out I have to say that this book was doomed to disappoint me, and it's only partly the author's fault. After being active in this fandom for almost a year, you have certain headcanons and ideas about characters that are very fixed, and this book just doesn't play into any of them, which is fine and shouldn't stop those people who want to from reading it.
I haven't finished this book, nor do I want to. The issues I do have are mainly with characterisation (particularly that of Reggie which you will see in a minute).
First of all the beginning scene was extremely disappointing to me. The book sets on right after the hug between the band at the end of the show when the guys are freed from Caleb's control and seem to get a second chance at afterlife. After, understandably, Alex wants to go check on Willie, and even Reggie (and you again will see in a minute why I say 'even') goes along with it - but Julie and Luke stay behind with some shared looks, and frankly I thought that was a little... strange. They just almost lost all of three them, and neither Luke or Julie in my opinion would want to split up with them just a few minutes later. Luke and the guys are basically brothers, they're supposed to be the closest of friends (they did die together, and keep saying stuff like 'it doesn't matter as long as we have each other') and I feel he'd be a little more worried about the two of them going out by themselves after such a traumatic event especially when they don't know where Caleb is or what he may or may not be planning. Julie would also not value a crush or even romantic love over platonic love, judging from her other relationships, and she honestly just almost lost them. This whole thing bothered me so much, honestly... just because they're teenagers doesn't mean all they care about is their hormones. There's time for Juke later when you've started digesting this near-death experience, thanks.
Things like that where they acted really weirdly bothered me in the following chapters too, but this one was one of the worst.
There was also a really awkward chapter from Alex' point of view where we got two really awkward explanations as to why he wears pink and Luke wears sleeveless shirts, and that bugged me because it was so ridiculous but also because the show did such a great job with Alex and this was just - not great. Alex isn't confident about a lot of things, but I don't see why that has to mean he can't confidently wear a pink shirt without accidentally putting a pink sock in with all his white clothes (which, cliché alert). Sure, he deals with it in the book by noting that he's always liked pink, but I don't know why we so desperately needed an excuse for him. In the early nineties, my father was walking around beaches in a playboy crop top, and Alex isn't exactly from rural Texas. He lives in LA, and he looks like a surfer. He can wear pink. (plus, you can't tell me Luke isn't tearing his sleeves off because he wants to show off his biceps and look like a Rockstar - in the book he falls into a rose bush and accidentally tears a hole in the sleeve - and only the sleeve... why? Why did we need an explanation for that? Nobody would have questioned the shirts. )
What I really really didn't like, though, was what was done to Reggie. Disclaimer, Reggie is my favorite and I have a lot of feelings about him, but I feel that even if I didn't I would be a little mad about this.
Reggie is a comic relief character even in the show, but I thought a novel would give some great opportunity to develop a rounded character! Apparently, I was wrong because in the novel he's less developed than in the show. In the narration of his friends, he mostly stays in the background and only comes in to say something dorky about how hungry he is, or about girls. That seems to be the extents of his character. Food and girls. Reggie gets to narrate few very short, relatively insignificant chapters and even there, in his brain, we get little more than food and girls (and a stupid line that makes him sound like a pick me boy because he's apparently so dorky and klutzy that he can't be too 'choosy' with the girls, which is why he just hits on all of them so chances are he gets one at some point). Oh, he's also stupid in literally every way except when it comes to playing his bass. The only small hint at depth are a few dips into his past in the form of a sentence about tensions at home and about three little paragraphs just by the way about his brother, who he wants to be some kind of hero to but isn't really around enough for. This is so inserted and so poorly explored, though, that it feels a bit like the author realised how flat they made him but didn't want to put in the work and change that, so they just added this for sympathy points.
Julie and the Phantoms is a children's show, and I am a student of literature, so if you buy this book for a kid, I'm sure they would enjoy it. However I'd personally think twice if I wanted to tell my kids stories that have girls that care more about pretty boys than they care about their friends and boys that fulfil all societal expectations and care about nothing than their basic carnal needs. Better let them watch the show. It worked too hard to tear down all those rigid norms to ruin it with this.
Two stars because I didn't finish it and maybe they saved it a little bit at some late point - and I feel bad giving this a horrible rating when it's just a children's book. Also I kinda liked Rose, a little. Still would not recommend this to anyone who liked the show for how refreshing it was in its character constellations because if you're one of them, you'd probably be better off waiting for the next season for the next ten years (or reading some good fanfiction).
I'm sorry for the author for this negative review, but I hope lots of people enjoy this book anyway. (Also I really like their writing style, so I'll definitely check out their non JatP work.)