In a London darkened by the fumes of machines and the ambitions of the powerful, humanity teeters between progress and decadence. Henri, a young artist who has lost his way, observes this world where steel and coal have supplanted nature and the soul. While automatons roam the streets, a mysterious being, half-man, half-machine, threatens the established order by attacking the very foundations of this society of gears and cogs. But the real dangers lie in the secret ambitions of the iron barons, who dream of an absolute fusion between man and machine. Driven by unexpected encounters and a quest for the truth, Henri ventures to the heart of an intrigue where politics, rebellion and betrayal are intertwined. Between past and future, this journey will reveal to each of us the part of humanity - or of iron - that lies dormant within us.