The printing press was the world's first mass-production machine. Its invention in the 1450s changed the world by sparking a cultural revolution which shaped the modern age. In this BAFTA nominated programme Britain's national treasure, Stephen Fry investigates Johann Gutenberg, the elusive inventor of the printing press. Stephen's investigation discovers the lengths to which Gutenberg went to keep his project secret, and uncovers the importance of printing in medieval Europe. To really understand the man Stephen must get his hands dirty, assembling a team of craftsmen to build a working copy of Gutenberg's original press. Can Stephen's team match the achievement of Gutenberg's medieval craftsmen?