The hill of dreams

"And above all his memorable epic of the sensitive aesthetic mind, The Hill of Dreams, in which the youthful hero responds to the magic of that ancient Welsh environment which is the author's own, and lives a dream-life in the Roman city of Isca Silurum, now shrunk to the relic-strown village of Caerelon-on-Usk. But the fact remains that his powerful horror-material of the 'nineties ans and earlier nienteen-hundreds stands alone in its class, and marks a distinct epoch in the history of this literary form." Howard Phillips Lovecraft. The Unbelievable - a collection of some of the greatest english or american selected fantastic stories.
And particularly if they talk about writing itself.