After a series of tragic events in the de Luce family, joy finally occurred. Yes, the older sister Ofelia gets married, pretty nerve-wracking to her chosen one and those around her. Flavia counts the minutes before the departure of the newlyweds and anticipates how relative peace will come in the estate of Bookshaw, and she herself will plunge into the work of the detective agency “Arthur U . Dogger and Partners . Careful Investigations" . However, the charming rural celebration is marred by an inexplicable incident - a severed finger is found in the wedding cake. Ophelia is fainting, and Flavia is delighted. Having pocketed her finger secretly from the police, she, along with Dogger, actively takes up the investigation. Soon after, they are hired by a certain Mrs. Prill to find the stolen letters, and the newly minted detectives simply do not know what to grab. But what if this time they came across a case that they can't stand?