Tony Robinson presents this documentary investigation into the truth behind Dan Brown's hugely successful bestselling novel 'The Da Vinci Code'. Did Jesus really die on the cross? Did he start a family with Mary Magdalene? And does that bloodline survive into the present, guarded by a secretive and shadowy society sworn to protect it? And was Renaissance genius Leonardo Da Vinci involved with this society, and did he leave clues about the true story in some of his most famous paintings?