Innovative evidence leads the team to discover a crucial element in the case has gone missing. Kreizler (Daniel Brühl) and Moore (Luke Evans) interview a witness to find out what happened to Moore at the Brothel. Sara (Dakota Fanning) attempts to live in a world outside the investigation. Kreizler challenges them to look within themselves.
After the world is morphed into a horrible and unrecognizable place – one where the Library never existed – it’s up to Baird to bring the Librarians together before this bleak, knowledge-less world becomes the new reality.