4.5 stars actually. 
 It wasn't as juvenile as I thought it would be (I've read some reviews that made me hesitant to read it - but I'm glad I finally did!). A lot of people had issues with the author's prose (descriptions that made no sense), but while I understand where they're coming from, I took no offense in them. Garber writes beautifully, and I found that I was completely enchanted and hooked from page one. 
 As for the characters, they were fun! I only had an issue with Scarlett's knowledge and ideas about her sister, Tella - how Tella was the reckless one, too easily manipulated, easy with guys, etc etc. (And it turns out she was wrong about everything about her sister!), it's like.... girrrrrrllllll. You don't know your sister. At all. And it really rubbed me the wrong way, so I gave it a 4-4.5 stars, instead of a 5-star rating. 
 And as for the plot, I really, really enjoyed it. It was pure fun. It was pure magic. And I really felt like I was in Caraval. A lot of people have compared Caraval to The Night Circus, but I think they're vastly different. Caraval is not even a circus. The only thing that they have in common is that they (The Caraval & The Night Circus) usually appear all of a sudden (I forgot if they're also both by invitations only, I read The Night Circus a long time ago). However, they're both amazing in their own right... in all their glorious differences and little similarities. 
 Fun, fun!