When Sky Patel-Baum is sent to live with her mysterious uncle, she never imagines she'll end up in Area 51, a top-secret military base. Sky feels like she's landed in a whole new world, even though she hasn't left the planet. Because guess what? Area 51 is full of aliens. Lots and lots of aliens. But something even stranger is happening in Area 51--aliens are going missing. Where could they be? How come everyone thinks Sky and her uncle are involved in their disappearance?