Charlie Greer is nothing special. At least not compared to her family. Her sister Opal is a ghost. Her brother Mateo is a werewolf. And her other brother Gideon has telekinetic powers.

Charlie's mother says her superpower is maturity, which Charlie hopes to prove when her parents go on vacation, leaving her in charge of her gifted siblings. How hard could it be?

But strange things start to happen when new neighbours move onto their street. The Weavers are a nice, normal couple. Too nice and too normal. And they don't seem to want Charlie to see inside their house. She's certain they're hiding something. Worse, she can't seem to keep her siblings away from them.

Can Charlie stop whatever the Weavers are planning, protect her siblings and make sure her parents still trust her ... all without any superpowers of her own?