The novel feature in the "Castle of Otranto" was its Gothic setting; the "wind whistling through the battlements"; the secret trap-door, with iron ring, by which Isabella sought to make her escape. "An awful silence reigned throughout those subterraneous regions, except now and then some blasts of wind that shook the doors she had passed, and which, grating on the rusty hinges, were re-echoed through that long labyrinth of darkness. The wind extinguished her candle, but an imperfect ray of clouded moonshine gleamed through a cranny in the roof of the vault and fell directly on the spring of the trap-door." But Walpole's medievalism was very thin. He took some pains with the description of the feudal cavalcade entering the castle gate with the great sword, but the passage is incorrect and poor in detail compared with similar things in Scott. The book was not an historical romance, and the manners, sentiments, language, all were modern. Walpole knew little about the Middle Ages and was not in touch with their spirit. At bottom he was a trifler, a fribble; and his incurable superficiality, dilettantism, and want of seriousness, made all his real cleverness of no avail when applied to such a subject as "The Castle of Otranto."[14] Walpole's tragedy, "The Mysterious Mother," has not even that degree of importance which secures his romance a niche in literary history. The subject was too unnatural to admit of stage presentation. Incest, when treated in the manner of Sophocles (Walpole justified himself by the example of "Oedipus"), or even of Ford, or of Shelley, may possibly claim a place among the themes which art is not quite forbidden to touch; but when handled in the prurient and crudely melodramatic fashion of this particular artist, it is merely offensive. "The Mysterious Mother," indeed, is even more absurd than horrible. Gothic machinery is present, but it is of the slightest. The scene of the action is a castle at Narbonne and the _chatelaine_ is the heroine of the play. The other characters are knights, friars, orphaned damsels, and feudal retainers; there is mention of cloisters, drawbridges, the Vaudois heretics, and the assassination of Henri III. and Henri IV.; and the author's Whig and Protestant leanings are oddly evidenced in his exposure of priestly intrigues.