Set in Pompeii on the slopes of Vesuvius, Bulwer‑Lytton’s tale interweaves a vivid social panorama—atria and peristyles, baths, temples (notably Isis and Cybele), the forum and amphitheatre—with a compact cast whose private passions mirror the town’s public life. Pompeii functions as a moral microcosm where Roman ostentation, Greek refinement, Egyptian occultism and emergent Christianity collide beneath persistent volcanic omens.

Central figures: Glaucus, an Athenian gentleman of culture and feeling, is passionately attached to Ione, a proud Neapolitan of classical sensibility and Apaecides’s sister. Arbaces, an Egyptian adept in magic and intrigue, is guardian to Ione and Apaecides but secretly covetous of Ione and ruthless in his designs. Apaecides, impressionable, first a priest of Isis then converted to Christianity by Olinthus, becomes the pivot of conflict. Nydia, a blind Thessalian flower‑girl, rescued into Glaucus’s household and devoted to him, loves in silence and later acts with desperate selflessness. Around them are a ring of complacent or venal Pompeians—Julia (vain and jealous), Burbo, Diomed, Calenus (a compromised priest), Sallust—and the nascent Christian community led by Olinthus and figures like Medon.

The plot tightens through intrigue. Arbaces manipulates Apaecides—first through religious flattery, then by vice—to isolate Ione and hush any exposure of his occult frauds. Apaecides’s apostasy and plan to expose the oracular machinery attract the attention of Calenus and Arbaces; Arbaces murders Apaecides in the shrine‑grove and frames Glaucus. Parallel scheming sees Julia seek a love philtre and Nydia, in her confusion and devotion, substitute or administer a draught that plunges Glaucus into drugged delirium, further implicating him. A public trial and gladiatorial spectacles heighten the moral contrast: the amphitheatre’s appetite for blood (the death of the youth Lydon witnessed by his Christian father Medon) stands against acts of compassion and witness.

At the arena Calenus, rescued by Sallust at Nydia’s instigation, denounces Arbaces; popular fury threatens the Egyptian. The drama is abruptly superseded by nature: Vesuvius erupts in apocalyptic fury—earthquakes, ash, pumice and boiling torrents. The catastrophe both interrupts civic vengeance and amplifies human passions. Amid the chaos Arbaces attempts to seize Ione and is crushed beneath falling masonry; Nydia twice saves Glaucus, and in the panic vanishes—implied to have drowned in the sea—her fidelity memorialized later by a tomb.

In the aftermath Glaucus and Ione escape by ship; years later Glaucus, now a Christian, writes from Athens of loss, conversion and memory. The novel’s motifs—faiths in collision, hypocrisy cloaked as occult prestige, love and jealousy, fate presaged by volcanic signs, and spectacle versus pity—culminate in a tragedy where private vice and public ritual converge beneath elemental ruin. Nineteenth‑century excavations, with preserved houses and skeletons, would later seem to corroborate the suddenness and scale of that collapse.