A young American heiress, terminally ill, becomes the unwitting center of a complex social and financial scheme orchestrated by two impoverished lovers. Milly Theale, the protagonist, seeks to experience the fullness of life before her impending death, unaware that her newfound acquaintance, Kate Croy, and Kate's lover, Merton Densher, are manipulating her affections to secure a future inheritance. The narrative operates through a third-person limited perspective that shifts between the internal consciousness of the primary characters, emphasizing the psychological weight of their moral compromises. The world is defined by the rigid social hierarchies of turn-of-the-century London and Venice, where reputation and wealth dictate the boundaries of human interaction.

Readers and critics frequently note the dense, challenging nature of the prose, which demands significant attention to detail. Discussion often centers on the ethical complexity of the central plot and the author's nuanced portrayal of human greed and altruism. Many highlight the effectiveness of the atmospheric shift from London to Venice as a mirror for the protagonist's declining health. The work is widely regarded for its psychological depth and the precision with which it dissects the social maneuvers of its characters. Readers often find the slow pacing to be a deliberate choice that enhances the gravity of the final revelations.