Gateway (The Gateway Trilogy Book 1) by Christina Garner

Everybody has their demons… Ember’s want her dead.

Ember has always known that she doesn’t belong in this world, but when she takes matters into her own hands, she winds up in a mental institution.

There she draws the attention of Taren, a mysterious boy with a dangerous secret.

When demons attack, they are forced to flee together, and Ember learns her secret might be the deadliest of all.

With a gateway to hell opening in Los Angeles, Ember must choose–will she save the world…or end it?