The Pillars of the Earth (The Pillars of the Earth series; Book 4) by Ken Follett.

In La armadura de la luz, Ken Follett delivers an expansive and riveting story set in 1792, where the world is teetering between the old order and the dawn of industry. The familiar town of Kingsbridge is once again at the centre of change: textile factories rise, machines hum, and workers feel the pressure of a new era. Meanwhile, across Europe, the ambitions of Napoleon Bonaparte threaten to plunge the continent into war. 
Sal Clitheroe, a determined spinner, David Shoveller, an idealistic weaver, and Kit, Sal’s brilliant son, find themselves caught in the clash of progress and oppression. As their lives entwine with Kingsbridge’s fate, the novel examines how innovation can liberate — but also exploit — those who power it. 
Follett masterfully balances historical detail with emotional intensity, portraying the rise of industrial power and the human cost of ambition. This fourth instalment of the beloved “Pillars of the Earth” saga invites readers to witness not only grand events — revolution, empire, industry — but the personal stories of those who live through them.
Perfect for fans of sweeping historical fiction, La armadura de la luz is a dramatic, immersive novel about change, resistance and the forging of a new age.