Esme Pearl's life used to be all about bumming rides and babysitting. Sure, it wasn't glamorous, but it was predictable. All that changed when Cassandra Heaven came to town, and they discovered their complicated, and connected, legacy: Esme and Cassandra are Sitters, supernaturally gifted teens armed with an ever-changing grimoire of Sitter witchcraft to help them protect the innocent and keep evil demons at bay. You know, the typical teenage stuff.

But just as Esme is starting to adjust to - and maybe even like - her new normal, life lobs another glitter bomb her way. The Synod - the Sitterhood's governing circle - has called a Summit, a once-in-a-generation gathering that promises training, education, and whole lot of ice-breakers.

Esme should be excited - a Summit might mean she can finally get the answers she desperately wants - but she can't shake a building sense of panic. Especially since Cassandra's not acting like herself; Esme's dad is MIA; Pig is out of dog food; Janis is scared to be alone; and there's a guy who seems too good to be true, again. Worst of all, it soon becomes clear, there's no one watching the kids. It's obvious the Summit is a haute mess, but will it be a deadly one, too?