This novel is a combination of a `roman à clefs' and science fiction, with gothic and autobiographic elements.
In her vision of the end of the 21st century, Mary Shelley sees the Greek occupying Istanbul and England as a republic with three political parties (royalists, democrats and aristocrats). The leader of the democrats deserts his responsibilities through fear of the plague, while the intention of the head of the aristocrats (a highly idealized portrait of P.B. Shelley) is `to diminish the power of the aristocracy to effect a greater equalization of wealth and privilege and to introduce a perfect system of republican government.'
Byron (Lord Raymond) is not in the same league: `Power was the aim of all his endeavors. The selected passion was ambition.'
Her vision of mankind is pessimistic: `There was but one good and one evil in the world - life and death.'
For life, `The choice is with us; let us will it and our habitation becomes a paradise.'
But, `What is there in our nature that is for ever urging us on towards pain and misery? We are not formed for enjoyment; disappointment is the never-failing pilot of our life's bark, and ruthlessly carries us to the shoals.'
`It is a strange fact, but incontestable, that the philanthropist, who ardent in his desire to do good, who disdains other argument than truth, has less influence over men's mind than he who refuses not to adopt any means, nor diffuse any falsehood for the advancement of his cause.'
Man doesn't control his destiny and the whole of mankind is wiped out by the plague. But, even on the verge of total destruction, false prophets preach intolerance with their `pernicious doctrines of election and special grace'.
This book is brilliantly written: `He was no longer bent to the ground, like an over-nursed flower of spring that, shooting up beyond its strength, is weighed down even by its own coronal of blossoms.'
It has a few minus points: slow progression, too idealized main characters and a rather too simplistic cause of the whole destruction of mankind.
But, it remains a real discovery and a very worth-while read, with an excellent introduction by Pamela Bickley.
Many novels have the plague as subject. I recommend highly `Bassompierre' by Hugo von Hofmannsthal.