S4, E12: We're with Flynn, six months earlier, the day he supposedly resigned from the Library. As it turns out, Nicole faked Flynn's resignation and imprisoned him as part of her plot to make the Librarians question their allegiance to the Library. Flash forward then to Baird, as we left her after the events of "And the Trial of the One". She's alone and her memory of the Library fading fast. Struggling to keep The Library alive, she recalls Flynn's technique of a memory palace. She creates her own, holding tightly to specific visuals to lock her visualisation of The Library in place.