Pierra is not a sorcerer by choice. She is tricked into joining the Aggregate — a concealed society enabling sorcerers to live apart from the ordinary world — where she is unwillingly transformed into The Peculiar, an investigator designed to find people, places, and artifacts unrecoverable by other means. Furious at the violation and determined to leave, Pierra is forced to remain. When the book of spells used to imbue her with magic — her only hope of understanding what’s been done to her — goes missing, she must learn how to investigate. A troubled past makes her doubt her own instincts, but worry her old world is at risk wins out. When the attacks begin even Pierra is under fire. More determined than ever to discover the book and return it to safety, she uncovers fractures at the foundation of the Aggregate and begins to realize there’s much more at stake than just finding a book.