The Haunted Library: The Ghost in the Attic (Used Book) - Dori Hillestad Butler
After successfully solving the mystery of the ghost in the library, Kaz and Claire land the first case for their detective agency—a haunted attic in a neighbor’s home! With a little help from Grannie, Kaz and Claire discover that what appeared to be something spooky has a much simpler explanation.
The Haunted Library #2
Paperback (back corner bent)