Lily is the niece of Squire Dale, an embittered old bachelor entrenched in the "Great House" at Allington. His sister-in-law lives at the adjacent "Small House" with her two daughters and the action centres on the relations between the two houses and on the romantic entanglements of the girls.

Engaged to the ambitious and self-serving Adolphus Crosbie, Lily Dale is devastated when he jilts her for the aristocratic Lady Alexandrina. Although crushed by his faithlessness, Lily still believes she is bound to her unworthy former fiancé for life and therefore condemned to remain single after his betrayal. And when a more deserving suitor pays his addresses, she is unable to see past her feelings for Crosbie. Written when Trollope was at the height of his popularity, The Small House at Allington (1864) contains his most admired heroine in Lily Dale - a young woman of independent spirit who nonetheless longs to be loved - and is a moving dramatization of the ways in which personal dilemmas are affected by social pressures.