Youthful, ambitious Peter Schoeffer is on the verge of professional success as a scribe in Paris when his foster father, the wealthy merchant and bookseller Johann Fust, summons him home to corruption- riddled, 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: printing copies of the Holy Bible. But when outside forces align against them, Peter finds himself torn between two father figures—the generous Fust and the brilliant, mercurial Gutenberg, who inspires Peter to achieve his own mastery.

Caught between the genius and the merchant, the old ways and the new, Peter and the men he admires must work together to prevail against overwhelming obstacles in a battle that will change history . . . and irrevocably transform them all.