Late in the evening, the body of the butler of the Fontaine family is discovered in a car on a rural road. But who could take the life of a devoted servant who had worked for many years on a rich estate? Private detective Frank Amberley joins the investigation of the crime and learns that the butler had large bank accounts. While he is trying to find out whether the deceased was blackmailing his owners, a new murder occurs on the estate... The murder of the wealthy landowner Sir Arthur on a country estate did not upset his relatives – he was a rather unpleasant person. On the day of his death, Sir Arthur disinherited his son, insulted his wife, severely offended his nephew and quarreled with one of the guests... Scotland Yard detective Harding, who is entrusted with the investigation, understands: there are many suspects, and each had both a motive and the opportunity to commit a crime. So who is the killer?