Gateway (Gateway Trilogy Book 1) by Christina Garner

My name is Ember, and I’ve always known I don’t belong in this world.

But when I tried to correct the mistake, I wound up in a nuthouse. That’s when things really got crazy.

A girl tried to stab me, a boy tried to save me, and I found out mean girls aren’t the only monsters.

Now a gateway to hell is about to open, and I’m supposed to save the world, but I don’t even know if I can save myself.

And yeah, I know—everybody has their demons. But mine want me dead.