*This is BOOK 3 in THE LIBRARIANS SERIES. To read book 3, you must have already read Books 1-2.*

Months have passed since Iris Blackwell was assassinated. Emerson never expected she would fill the role of Head Librarian so soon, but Foundation's members are relying on her. Even more importantly, Emerson is out for revenge after watching her mother's violent end. 

Tensions between the Libraries are poised to erupt and Foundation's Council has begun rooting out Archivists within its membership. However, one Archivist remains at large. His prey? Foundation's newest Head Librarian. While Silas and Emerson have become closer than ever, her relationship with Adrien is careening toward a confrontation that will send shockwaves through Foundation and The Central Library. 

As old alliances fracture and the past returns to haunt the Librarians, questions arise about the Catalogue's murky history. Have Foundation and The Central Library always existed separately--or do their Catalogues have a common ancestor? In her quest for answers, Emerson will have to decide who she can trust, even if it means aligning with those she once considered enemies. 

In the breathtaking third installment of The Librarians, Emerson comes face to face with the shadows lurking in the Catalogue as the lines between allies and enemies become more blurred than ever.