Tate Fairbanks is fourteen years old when she and a few boarding-school classmates form Le Cercle des Sœurs, a secret society hidden inside their Swiss finishing school. At its center is Pia Eastlake: charismatic, brilliant, and mercurial. Pia’s attention is everything Tate has ever wanted … until she realizes that whatever Pia gives, she expects in return. With interest.

Seven years later, out-of-work model Avia Sun arrives in Paris with only one contact. Pia has money, connections, and an irresistibly glamorous group of friends that call each other sisters. When Le Cercle invites her to be one of them, she’s flattered. But in every ritual and rule lurks the memory of Tate, who hasn’t been seen since her departure from Pia’s years ago.