Archie's Weird Mysteries - Season 1 Episode 6 The Haunting of Riverdale
Overview: Something is haunting Riverdale, and it seems to be related to the public library. After a bit of research, it is discovered that the ghost belongs to the former librarian, who was very devoted during life to the good of the library. It seems that she is still there because she has some unfinished business...and Jughead holds the key that will let her move on.