Youthful, ambitious Peter Schoeffer is on the verge of professional success as a scribe in Paris when his foster father, wealthy merchant and bookseller Johann Fust, summons him home to corrupt, feud-plagued Mainz to meet “a most amazing man.” Johann Gutenberg, a driven and caustic inventor, has devised a revolutionary—and to some, blasphemous—method of bookmaking: a machine he calls a printing press. Fust is financing Gutenberg's workshop and he orders Peter to become Gutenberg’s apprentice. Resentful at having to abandon a prestigious career as a scribe, Peter begins his education in the “darkest art.”

As his skill grows, so too does his admiration for Gutenberg and his dedication to their daring venture: copies of the Holy Bible. But mechanical difficulties and the crushing power of the Catholic Church threaten their work. As outside forces align against them, Peter finds himself torn between the genius and the merchant, the old ways and the new. He and the men he admires must work together to prevail against overwhelming obstacles—a battle that will change history . . . and irrevocably transform them.