In the final story, "The Vengeance of the Statue", Fisher notes: "The Prime Minister is my father's friend.
This knowledge is a burden to him in the eight stories, because he is able to uncover the injustices and corruptions of the murders in each story, but in most cases the real killer gets away with the killing because to bring him openly to justice would create a greater chaos: starting a war, reinciting Irish rebellions or removing public faith in the government.
By killing his host, the Prime Minister seeks to avoid a war in which many more people would die, and the financier would profit at the cost of thousands of lives.
Fisher, however, is forced to arrest Michael: "Wilson recovered, and we managed to persuade him to retire.
I managed to save Michael from the worst, but we had to send that perfectly innocent man to penal servitude for a crime we know he never committed; but it was only afterwards that we could connive in a sneakish way at his escape.
And Sir Walter Carey is Prime Minister of this country, which he would probably never have been if the truth had been told of such a horrible scandal in his department.