At Desert Mountain Academy, sixteen-year-old Nadia Riley begins a punishing routine to become an undercover CIA agent, but when a double-agent is reported on campus, she is the top suspect.

Explains the origins of the Billings girls and how they became witches, beginning with the arrival of sixteen-year-old Elizabeth Williams at the Billings School for Girls in September, 1915.

After her third arrest in one year, sixteen-year-old Allie's parents send her to Cimmeria Academy, a boarding school, where she finds herself exposing the dark secrets of the school and her classmates.

Over the course of one year at a Connecticut boarding school and a transformative summer in New York City in the 1980s, three young women negotiate friendship, crushes, parties, privilege, and the sexual interest of older men on the journey from innocence to independence.

High school sophomore Lily opens herself to new possibilities when, despite warnings, she becomes friends with "ghetto girl" Hazel, a new student at the private Vaughn School which Lily, following in her elitist mother's footsteps, has attended since preschool.

Isla has had a crush on classmate Josh since their freshman year at the School of America in Paris, but after a chance encounter over the summer in Manhattan they return to France for their senior year where they are forced to confront challenges every young couple in love must face.