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. 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 a 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. Worst of all, there’s no one watching the kids. It’s obvious the Summit is a haute mess, but will it be a deadly one, too?