Inside Out Tome 2 Menacée de Maria V. Snyder
Okay, I Did prove that there's more to inside than we knew. That a whole world exists beyond this cube we live in. And finding that led to a major rebellion - between worker scrubs like me and the snobby uppers who rule our world. Make the ruled. Because of me, we're free. I thought that meant I was off the hook, and could go off on my own again - while still touching base with Riley, of course. He's the one upper I think I can trust. But then we learned that ther's outside and then there is Outside.
And something from Outside wants In.