A widowed teacher marries again, but her hopes of her daughter accepting a stepfather her own age, and her anticipation of a birthday picnic by the river are clouded by a series of murders in the district and by a fear rooted rather nearer home.

A young girl, whose head is full of romantic and melodramatic notions, goes to stay with the wealthy Tilney family. Through her adventures, Catherine Morland comes to learn that marriage in the society of her day is determined not by true love but by wealth and social status.