And the Graves of Time (S04E06)

Baird seeks out Nicole Noone to mend her fractured relationship with the Library, but instead, she finds herself teaming up with Nicole on a quest to recover a perilous artifact before it is seized by Russian grave robbers. As they navigate this dangerous mission, Baird hopes to persuade Nicole to reconcile with the Library and come back with her. However, Nicole might just reveal the harsh realities of being a Guardian wholly devoted to the Library, challenging Baird’s perspective on her own commitment.