Taylot Yamin is a librarian who is good at tracking down bits of code. As the player-influenced operator says "nearly every string of inanimate code passes through her systems at some point."
The player needs to see her in the Mandarin first mission, who is after the rare code that would lead him to an artefact.
When the player arrives at the Librarian's apartment, the player had some attacking simulacra (from Anahit), with Taylot nowhere to be seen. The only other person seen in the apartment was the cowardly Elwood Meritel who refuses to leave the room he is in unless the Simulacra are all gone.