The Blue Lady of Coffin Hall

In the twenty-third book of the Nancy Drew Diaries series, Nancy and Ned visit Coffin Hall, a historic library, where they become involved in uncovering the truth behind a mysterious fire and a ghostly presence. As they investigate a series of strange incidents, Nancy seeks to reveal the real culprit behind the sabotage that threatens the library, all while navigating the eerie rumors and unexpected clues.