Augustus Melmotte is a financier with a mysterious past. He (or rather his wife) is rumoured to have Jewish origins, and to be connected to some failed businesses in Vienna. When he moves his business and his family to London, the city's upper crust begins buzzing with rumours about him—and a host of people ultimately find their lives changed because of him. Melmotte sets up his office in the
City of London and purchases a fine house in
Grosvenor Square. He sets out to woo rich and powerful investors by hosting a lavish party. He finds an appropriate investment vehicle when he is approached by an American entrepreneur, Hamilton K. Fisker, to float a company to construct a new railway line running from Salt Lake City, USA, to Veracruz, Mexico. Melmotte's goal is to ramp up the share price without paying any of his own money into the scheme itself, thus further enriching himself, regardless of whether or not the line gets built. Amongst the aristocrats on the company's board is Sir Felix Carbury, a dissolute young
baronet who is quickly running through his widowed mother's savings. In an attempt to restore their fortunes, as they are being beset by their creditors, his mother, Matilda, Lady Carbury—who is embarking on a writing career—endeavours to have him become engaged to Marie, Melmotte's only child, and thus a considerable heiress. Sir Felix manages to win Marie's heart, but his schemes are blocked by Melmotte, who has no intention of allowing his daughter to marry such a minor penniless aristocrat. Felix's situation is also complicated by his relationship with Ruby Ruggles, a pretty farm girl living with her grandfather on the estate of Roger Carbury, his well-off second cousin. Roger Carbury is an upright and moral squire living at the small, but pretty, family estate of Carbury Hall in
Suffolk. In the South Central Pacific and Mexican Railway Board meetings, chaired and controlled by Melmotte, Fisker's partner, Paul Montague, raises difficult questions. Paul's personal life is also complicated. He has fallen in love with Lady Carbury's young daughter Hetta—much to her mother's displeasure—but has been followed to England by his American fiancée, Mrs Winifred Hurtle. Mrs Hurtle is determined to make Paul marry her. Roger has been Paul's mentor, and the two come into conflict over their attentions towards Hetta. In the meantime, Felix Carbury is torn between his physical attraction to Ruby and his financial need to pursue Marie Melmotte (he is emotionally indifferent to both of them). Ruby, after being beaten by her grandfather for not marrying a respectable local miller, John Crumb, runs away to London and finds refuge in the boarding house owned by her aunt, Mrs Pipkin—where, as it happens, Mrs Hurtle is lodging. Felix learns from Ruby about Mrs Hurtle's relationship with Paul and, coming into conflict with Mrs Hurtle over his attentions to Ruby, reveals all his new-found knowledge to his mother and sister. Hetta is devastated and breaks off her engagement to Paul. Meanwhile, to keep Paul away from the board meetings, Melmotte attempts to send Paul off to Mexico on a nominal inspection trip of the railway line, but Paul declines to go. Finding that they cannot get around Melmotte, Felix and Marie decide to elope to America. Marie steals a blank cheque from her father and arranges to meet Felix on the ship at
Liverpool. Felix, who has been given money by Marie for his expenses, goes to his club and gambles it all away in card games after his friends resort to playing with ready money and not IOUs. Drunk and penniless, Felix returns to his mother's house, knowing the game is up. Meanwhile, after Melmotte has been alerted by his bank, Marie and her maid, who believe that Felix is already on the ship at Liverpool, are intercepted by the police before they can board the ship, and Marie is brought back to London, while Didon the maid boards the ship and sails to New York. Melmotte, who by this time has also become Member of Parliament for
Westminster and the purchaser of a grand country estate belonging to Mr Longestaffe, also knows that his financial house of cards is nearing collapse. When Longestaffe and his son demand the purchase money for the estate Melmotte had bought, Melmotte forges his daughter's name to a document that will allow him to get at her money (money that Melmotte had put in her name precisely to protect it from creditors, and which Marie refused to give back to him). He tries to get his clerk, Croll, to witness the forged signature. Croll refuses. Melmotte then also forges Croll's signature, but makes the mistake of leaving the documents with Mr Brehgert, a banker. When Brehgert takes the documents to Croll for one further signature (which Melmotte had omitted to forge), rather than to Melmotte, Croll discovers the forgery and leaves Melmotte's service. With his creditors now knocking at his door, the railway shares nearly worthless, charges of forgery looming in his future, and his political reputation in tatters after a drunken appearance in the
House of Commons, Melmotte poisons himself. The remainder of the novel ties up the loose ends. While Felix is out with Ruby one evening, John Crumb comes upon them and, believing that Felix is forcing his attentions on her, thoroughly beats Felix. Ruby finally realises that Felix will never marry her, and returns home to marry John. Felix is forced to live on a small allowance in the British community in
East Prussia, to which he is taken by the Anglican priest who is being sent to minister to them. Lady Carbury marries Mr Broune, who has been a true friend to her throughout her troubles. Hetta and Paul are finally reconciled after he tells her the truth about Mrs Hurtle. Roger forgives Paul and allows the couple to live at Carbury Manor, which he vows to leave to their child. Marie, now financially independent, becomes acquainted with Hamilton K. Fisker, and agrees to go with him to San Francisco, where she eventually marries him. She is accompanied by her stepmother, Madame Melmotte; Croll, who marries Madame Melmotte; and Mrs Hurtle. ==Adaptations==