Scarlett grew up in the woods, forgotten, isolated and alone.
Liz grew up in a foster home for "troubled kids", whatever that means.
Then one day, while Liz is on a field trip, she sneaks off, and stumbles upon Scarlett. At first they can't stand each other, but they realize that the only way to stay alive is to trust each other. But it's hard to stay alive when the most powerful beings in the world are trying to kill you. As they fight to stay alive, they realize that there is a lot more to the world than everyone else knows.