Mariana Andros, a brilliant but troubled group therapist, becomes fixated on a secret society of female students known as "The Maidens" at Cambridge when one of its members, a friend of her niece Zoe, is found murdered. Mariana, a former student herself, suspects the charismatic Greek Tragedy professor, Edward Fosca, is the killer, despite his adoration by students and staff. As she delves deeper into the mystery, she uncovers a dark web of secrets, obsession, and the profound consequences of grief.