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In the Regency era, a decent woman needed to be able to do a little to get married successfully: have perfect manners, be good at embroidery, singing, and painting. However, none of these things are good enough for Beatrice, the eldest daughter of the Steele family. The girl is best at... solving crimes.

The family is about to lose their roof over their heads. The mother is in despair, and the father, a joker, finds the situation funny. Moreover, the most desirable bachelor in Swampshire will soon arrive at the ball. And what a disappointment the family is when, in the middle of the dance, the young man falls dead. But for Beatrice, this is a chance to put her skills to work and catch the killer. So for one evening she becomes the partner of a silent and not very gallant detective who suddenly appears at the crime scene. After all, Beatrice's main talent is to notice the smallest details. But will this be enough to catch the criminal before he commits another murder?