Red Glass

Pearls parents decide that her and her brother would have a FANTASTIC time at her old grandmas house, in New Orleans.
Her grandma is an old crab apple who makes good food, but is sort of a nut job. So when Pearl finds a glass ball on her dresser, and when she drops the glass ball, and it turns into her human guardian, she thinks it's all a joke.

But it's not. She finds out that her ancestors signed a pact with the Leigha tribe, sentencing themselves to protecting us in return for the ability to live a long time. But they didn't realize that the pact was a Blood pact. That means that their lives are bound together. Pearls ancestors liked blackmail a little too much.

So, now she has some over protective person hanging around her, and the plague starts.

Fan-freaking-tastic