Intertwined is a book that is complicated. The main character Aiden has a complicated problem (extra souls in his body that talk to him all the time and have strange powers). He meets a girl (Mary Ann) who effects him in a complicated way that he's intrigued by. He also falls in love with a vampire girl who he knows will one day kill him. And there's a werewolf that falls for Mary Ann who is also the protector of Vampire girl and who hates Aiden.
The plot plods by with things conveniently working out and strange subplots and extra characters being introduced that don't really matter that much to the plot and everything just gets more complicated and then conveniently works it's way to the end while not tying up most of the loose ends.
Had the author chose to just focus on the many souls plot or just the plot with the mystical creatures then perhaps this book would have been better, but as it was written it was just too complicated and convenient to the point where I didn't care much when the end came around. I did finish the book (which I can't say about everything I get) so it wasn't that bad, but I'm not going to be reading it again.
Appropriateness: I read this book a while ago so I don't remember much of the details. It is a YA book targeted towards the high school audience. It also has a male protagonist which is unusual.