A shocking discovery has been made deep within Rome's ancient catacombs. One that the Vatican is determined must never be made public - for the sake of all mankind. But there are others who want to keep the truth hidden for far more sinister reasons; these people believe that not only is the church and the faith of a billion under threat, but life as we know it is about to be destroyed - for ever. And only one woman - a devoted Italian nun - can save us ...