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** spoiler alert ** 3.5 stars

This is a reread ... I think I first read this in 2017 but I reread it because one of the other books I read recently tried to pull the same twist.

Probably one of the better executions of the "main character has split personality" trope... the first 60% of the book feels very juvenile (like even for YA) and certain things feel off (like the characters are seniors in high school but none of them talk about going to college or anything else) but during part 2 it gets explained...

Part 2 could've been fleshed out a bit more, and I found it a bit unrealistic that Hamilton had multiple, drastically different personalities and no one except Alex picked up on it. Like okay her mom was busy working but no classmates, no teachers?

And all the enabling pissed me off, Alex gets a pass because he's only a kid but Hamilton's mom should've known better. Another interesting note is that this book was written in 2011. Even though that was 11 (!) years ago, the way the other characters talk about mental illness feels extremely dated, but it wasn't bad enough to take me out of the story.