The novel "The Key" is the first book of a historical trilogy about the era of October: "The Key" — "Flight" — "The Cave".
Drawing on the experience of the French Revolution, M. Aldanov makes a kind of forecast of those phenomena that Soviet Russia had yet to experience.
Aldanov’s novels have a dialogic structure. The writer depicts events not in their unfolding, but as refracted through the consciousness of philosophizing heroes who grapple with the pressing political problems of their time and the eternal "accursed" questions of existence. In the novel "The Key," the dialogues between the chemist Braun, who holds left-wing views, and Fedosyev, the head of the secret police and a conservative by conviction, represent two points of view located at opposite poles and at the same time complementing one another. In the context of the novel as a whole, truth turns out not merely to lie between the poles, but to absorb all extremes.