Prior to the outbreak, this was a library where people would check out books.
When Judith asks Luke what he was whistling before, he explains he was whistling one of his favorite songs and writes it down for her in a book where she is documenting everything that happens to them for the future. Shortly after, Luke convinces Michonne to stop at a nearby library along the way to look for more books.
When the group heads inside, Judith finds a Russian-English dictionary she gives to Luke for Eugene to understand the satellite parts before he heads to the music section. Michonne is called over the radio by Magna as Luke is attacked by two walkers. While struggling, a man saves his life before fleeing. The group arrives after hearing his screams and Luke tells them about the man who saved him. Michonne informs him about Siddiq's death and says they should hurry.