Charlie's mom says her superpower is maturity—which doesn't really count. But what Charlie lacks in powers she makes up for by keeping the household running. Now, with her parents off on their first vacation in years, it’s up to her to take care of her siblings and make sure nothing disrupts the trip.
But then the new neighbors arrive. The Weavers are a nice, normal couple. Too nice and too normal. And for some reason, they don't seem to want Charlie to see inside their house. She’s certain they’re hiding something. Charlie has to uncover what's going on with the Weavers and stop their plans—without letting Mom and Dad find out anything is wrong.