It is the third book of the Lord Peter Wimsey collection. Agatha Dawson, who was suffering from cancer, dies; in the autopsy that Dr. Carr does, he finds no evidence of anything strange, so it is decided that the death was natural. Lord Peter Wimsey suspects that the investigation should not have been closed and although he has no clues, he begins his own investigation with the help of Detective Parker of Scotland Yard. A short time later Bertha, one of Agatha's servants, also turns up dead. This is an incentive to continue the investigation more quickly.
The style is agile, pleasant, simple. It has good narrative quality. The plot is interesting and the main characters are well developed. The main character is magnificent for his intelligence, capacity of observation, deduction and perseverance to find the truth. He uses psychological methods to solve the case.
The author (1893-1957) was born in Oxford, was one of the first women to obtain a university degree, specifically a degree in Medieval French. She was a friend of C.S. Lewis and together with Chesterton formed the "Detection club". She is well known for her detective and suspense novels.