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Goodreads asked David Griffiths:

What mystery in your own life could be a plot for a book?

David Griffiths When I was 15, I crawled into an iron age barrow. It was a bright sunny day but when I reached the end of the passage the mud wall in front of me was moving up and down! When I turned back to the light all was stable but looking back at the wall it was still moving.
I may include that experience in a future book!

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