The anti-heroine of the novel is Arabella Trefoil. Her father is cousin to the Duke of Mayfair; her mother was a banker's daughter. Her parents are unofficially separated, and living in straitened circumstances. Arabella and her mother, Lady Augustus Trefoil, have no fixed abode; they wander from place to place, visiting people who cannot refuse them without creating social awkwardness. At Lady Augustus's direction, Arabella has spent many years struggling to secure a rich husband who will give her and her mother high social standing, an assured income, and a house of their own. She has lately become provisionally engaged to John Morton, the squire of Bragton and a rising figure in the Foreign Office. He would be an adequate but not outstanding husband by her standards; and when the opportunity presents itself, she attempts to entrap the wealthy and titled young Lord Rufford, concealing these attempts from Morton so that she can accept his proposal should they fail.