What is the ISBN of The Ghost Blackwood Hall?

There is no book titled "The Ghost Blackwood Hall" that has a widely published ISBN. It's possible this is:

* A self-published book: Self-published books may not always have ISBNs, or they might have ISBNs assigned by smaller, less-traced ISBN agencies.

* A working title: The book might have a different title.

* A fictional book: The title might be from a fan-made work or a fictional context.

To find the ISBN, you'll need to provide more information, such as the author's name or a more complete title.