Late Night Library is a whimsical story of the books in a library "coming alive" late at night and having their own night-time party. When the commotion gets too loud, the books attract a policeman on the beat. When he finds the celebration, he summons the librarian to come have a look. Upon her arrival, she is shocked, and then quiets her book friends and gets the library back in order for the kids who will be visiting the next day.