I wrote a post about the stories in this collection a little while back, and you can read it by clicking here.
You can pre-order it directly from Nezu Press by clicking here. Or you can order it from the usual online retailers (order buttons will begin to appear on sites a few days from now) or from your local bricks-and-mortar bookshop.
Anyway, here's the publisher blurb and all that:
Ellen Glasgow wrote only thirteen short stories during her long career, seven of which appeared in The Shadowy Third. Published in 1923 by Doubleday, Page & Company, it was the only collection of short stories published during her lifetime. Of the seven tales it contains, only four are supernatural, but all have an eerie quality to them; in fact, ‘Jordan’s End’, a non-ghost story, is the most ghostly story that the author ever wrote. This new edition contains the seven stories included in the first edition and adds to those tales a seventeen-page biographical essay by Gina R. Collia, ‘Ellen Glasgow: The Solitary Spirit’. (Publisher website: Click here)