It looks like there are a number of used copies floating around both under "Odd and Elsewhere and the Secret of the Seven Bright Shiners" and as simply "The Secret of the Seven Bright Shiners" and there are tantalizing appearances of the title mentioned in other books that turn up as less-than-useful snippets of Google Books previews. A bricks-and-mortar library might be able to help.... did you find the list of the other Odd and Elsewhere titles already?