He describes how his physical ugliness repels human beings, who fail to realise his benevolent intentions. A father snatches from his arms the child he has rescued from death; the virtuous family, whom he admires and would fain serve, flee affrighted from his presence. To educate the monster, so that his thoughts and emotions may become articulate, and, incidentally, to accentuate his isolation from society, Mrs. Shelley inserts a complicated story about an Arabian girl, Sofie, whose lover teaches her to read from Plutarch's Lives, Volney's Ruins of Empire, The Sorrows of Werther, and Paradise Lost. The monster overhears the lessons, and ponders on this unique library, but, as he pleads his own cause the more eloquently because he knows Satan's passionate outbursts of defiance and self-pity, who would cavil at the method by which he is made to acquire his knowledge? "The cold stars shone in mockery, and the bare trees waved their branches above me; now and then the sweet voice of a bird burst forth amidst the universal stillness. All save I were at rest or in enjoyment. I, like the arch fiend, bore a hell within me." And later, near the close of the book: "The fallen angel becomes a malignant devil. Yet even that enemy of God and man had friends and associates in his desolation; I am alone," His fate reminds us of that of Alastor, the Spirit of Solitude, who:

"Over the world wanders for ever
Lone as incarnate death."

After the long and moving recital of his woes, even the obdurate Frankenstein cannot resist the justice of his demand for a partner like himself. Yet when the student recoils with horror from his half-accomplished task and sees the creature maliciously peering through the window, our hatred leaps to life once more and burns fiercely as the monster adds to his crimes the murder of Clerval, Frankenstein's dearest friend, and of Elizabeth on her wedding night. We follow with shuddering anticipation the long pursuit of the monster, expectant of a last, fearful encounter which shall decide the fate of the demon and his maker. Amid the region of eternal ice, Frankenstein catches sight of him; but fails to reach him. At last, beside the body of his last victim—Frankenstein himself—the creature is filled with remorse at the "frightful catalogue" of his sins, and makes a final bid for our sympathy in the farewell speech to Walton, before climbing on an ice-raft to be "borne away by the waves and lost in darkness and distance."

Like Alastor, Frankenstein was a plea for human sympathy, and was, according to Shelley's preface, intended "to exhibit the amiableness of domestic affection and the excellence of universal virtue." The monster has the perception and desire of goodness, but, by the circumstances of his abnormal existence, is delivered over to evil. It is this dual nature that prevents him from being a mere automaton. The monster indeed is far more real than the shadowy beings whom he pursues. Frankenstein is less an individual than a type, and only interests us through the emotions which his conflict with the monster arouses. Clerval, Elizabeth and Frankenstein's relatives are passive sufferers whose psychology does not concern us. Mrs. Shelley rightly lavishes her skill on the central figure of the book, and succeeds, as effectually as Frankenstein himself, in infusing into him the spark of life. Mrs. Shelley's aim is to "awaken thrilling horror," and, incidentally, to "exhibit the excellence of domestic virtue," and for her purpose the demon is of paramount importance. The involved, complex plot of a novel seemed to pass beyond Mrs. Shelley's control. A short tale she could handle successfully, and Shelley was unwise in inciting her to expand Frankenstein into a long narrative. So long as she is completely carried away by her subject Mrs. Shelley writes clearly, but when she pauses to regard the progress of her story dispassionately, she seems to be overwhelmed by the wealth of her resources and to have no power of selecting the relevant details. The laborious introductory letters, the meticulous record of Frankenstein's education, the story of Felix and Sofie, the description of the tour through England before the creation of the second monster is attempted, are all connected with the main theme by very frail links and serve to distract our attention in an irritating fashion from what really interests us. In the novel of mystery a tantalising delay may be singularly effective. In a novel which depends chiefly for its effect on sheer horror, delays are merely dangerous. By resting her terrors on a pseudo-scientific basis and by placing her story in a definite locality, Mrs. Shelley waives her right to an entire suspension of disbelief. If it be reduced to its lowest terms, the plot of Frankenstein, with its bewildering confusion of the prosaic and the fantastic, sounds as crude, disjointed and inconsequent as that of a nightmare. Mrs. Shelley's timid hesitation between imagination and reality, her attempt to reconcile incompatible things and to place a creature who belongs to no earthly land in familiar surroundings, prevents Frankenstein from being a wholly satisfactory and alarming novel of terror. She loves the fantastic, but she also fears it. She is weighted down by commonsense, and so flutters instead of soaring, unwilling to trust herself far from the material world. But the fact that she was able to vivify her grotesque skeleton of a plot with some degree of success is no mean tribute to her gifts. The energy and vigour of her style, her complete and serious absorption in her subject, carry us safely over many an absurdity. It is only in the duller stretches of the narrative, when her heart is not in her work, that her language becomes vague, indeterminate and blurred, and that she muffles her thoughts in words like "ascertain," "commencement," "peruse," "diffuse," instead of using their simpler Saxon equivalents. Stirred by the excitement of the events she describes, she can write forcibly in simple, direct language. She often frames short, hurried sentences such as a man would naturally utter when breathless with terror or with recollections of terror. The final impression that Frankenstein leaves with us is not easy to define, because the book is so uneven in quality. It is obviously the shapeless work of an immature writer who has had no experience in evolving a plot. Sometimes it is genuinely moving and impressive, but it continually falls abruptly and ludicrously short of its aim. Yet when all its faults have been laid bare, the fact remains that few readers would abandon the story half-way through. Mrs. Shelley is so thoroughly engrossed in her theme that she impels her readers onward, even though they may think but meanly of her story as a work of art.

Mrs. Shelley's second novel, Valperga, or the Life and Adventures of Castruccio, Prince of Lucca, published in 1823, was a work on which she bestowed much care and labour, but the result proves that she writes best when the urgency of her imagination leaves her no leisure either to display her learning or adorn her style. She herself calls Valperga a "child of mighty slow growth," and Shelley adds that it was "raked out of fifty old books." Mrs. Shelley, always an industrious student, made a conscientious survey of original sources before fashioning her story of mediaeval Italy, and she is hampered by the exuberance of her knowledge. The novel is not a romance of terror; but Castruccio, though his character is sketched from authentic documents, seems towards the end of the story to resemble the picturesque villain who numbered among his ancestry Milton's Satan. He has "a majestic figure and a countenance beautiful but sad, and tarnished by the expression of pride that animated it." Beatrice, the gifted prophetess who falls deep in love with Castruccio, ends her days in the dungeons of the Inquisition. Mrs. Shelley's aim, however, is not to arouse fear, but to trace the gradual deterioration of Castruccio's character from an open-hearted youth to a crafty tyrant. The blunt remarks of Godwin, who revised the manuscript, are not unjust, but fall with an ill grace from the pen of the author of St. Leon: "It appears in reading, that the first rule you prescribed was: 'I will let it be long.' It contains the quantity of four volumes of Waverley. No hard blow was ever hit with a woodsaw."[121]

In The Last Man, which appeared in 1825, Mrs. Shelley attempted a stupendous theme, no less then a picture of the devastation of the human race by plague and pestilence. She casts her imagination forward into the twenty-first century, when the last king of England has abdicated the throne and a republic is established. Very wisely, she narrows the interest by concentrating on the pathetic fate of a group of friends who are among the last survivors, and the story becomes an idealised record of her own sufferings. The description of the loneliness of the bereft has a personal note, and reminds us of her journal, where she expresses the sorrow of being herself the last survivor, and of feeling like a "cloud from which the light of sunset has passed."[122] Raymond, who dies in an attempt to place the standard of Greece in Stamboul, is a portrait of Byron; and Adrian, the late king's son, who finally becomes Protector, is clearly modelled on Shelley. Yet in spite of these personal reminiscences, their characters lack distinctness. Idris, Clara and Perdita are faintly etched, but Evadne, the Greek artist, who cherishes a passion for Raymond, and dies fighting against the Turks, has more colour and body than the other women, though she is somewhat theatrical. Mrs. Shelley conveys emotion more faithfully than character, and the overwrought sensibilities and dark forebodings of the diminished party of survivors who leave England to distract their minds by foreign travel are artfully suggested. The leaping, gesticulating figure, whom their jaded nerves and morbid fancy transform into a phantom, is a delirious ballet-dancer; and the Black Spectre, mistaken for Death Incarnate, proves only to be a plague-stricken noble, who lurks near the party for the sake of human society. These "reasonable" solutions of the apparently supernatural remind us of Mrs. Radcliffe's method, and Mrs. Shelley shows keen psychological insight in her delineation of the state of mind which readily conjures up imaginary terrors. When Lionel Verney is left alone in the universe, her power seems to flag, and instead of the final crescendo of horror, which we expect at the end of the book, we are left with an ineffective picture of the last man in Rome in 2005 deciding to explore the countries he has not yet viewed. As he wanders amid the ruins he recalls not only "the buried Cæsars," but also the monk in The Italian, of whom he had read in childhood—a striking proof of Mrs. Shelley's faith in the permanence of Mrs. Radcliffe's fame.

Though the style of The Last Man is often tediously prolix and is disfigured by patches of florid rhetoric and by inappropriate similes scattered broadcast, occasional passages of wonderful beauty recall Shelley's imagery; and, in conveying the pathos of loneliness, personal feeling lends nobility and eloquence to her style. With so ambitious a subject, it was natural that she should only partially succeed in carrying her readers with her. Though there are oases, the story is a somewhat tedious and dreary stretch of narrative that can only be traversed with considerable effort.

Mrs. Shelley's later works—Perkin Warbeck (1830), a historical novel; Lodore (1835), which describes the early life of Shelley and Harriet; Falkner (1837), which was influenced by Caleb Williams—do not belong to the history of the novel of terror; but some of her short tales, contributed to periodicals and collected in 1891, have gruesome and supernatural themes. A Tale of the Passions, or the Death of Despina[123] a story based on the struggles of the Guelphs and the Ghibellines, contains a perfect specimen of the traditional villain of the novel of terror:

"Every feature of his countenance spoke of the struggle of passions and the terrible egotism of one who would sacrifice himself to the establishment of his will: his black eyebrows were scattered, his grey eyes deep-set and scowling, his look at once stern and haggard. A smile seemed never to have disturbed the settled scorn which his lips expressed; his high forehead was marked by a thousand contradictory lines."

This terrific personage spends the last years of his life in orthodox fashion as an austere saint in a monastery.