Henry Lincoln guides the viewer on a tour of Rennes-le-Château to discover the mysteries surrounding priest Bérenger Saunière as described in Dan Brown's book, The da Vinci code.

The Tardis narrowly avoids becoming engulfed in a cobwebby substance in space. It arrives in the London Underground railway system, the tunnels of which are being overrun by the web and by the Great Intelligence's robot Yeti. The Intelligence's goal is to drain the Doctor's mind; can the Doctor sabotage the device before the Intelligence's plan comes to fruition? The release includes all surviving episodes, plus a brand new fully animated reconstruction...