The Devil Will Come — Glenn Cooper

A terrifying secret. 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. A deadly conspiracy. But there are others who want to keep the truth hidden for far more sinister reasons, others who believe that not only are the church and the faith of a billion at threat, but life as we know it is about to be destroyed - for ever. And only one woman - a young Italian nun - can save us... The nightmare is about to begin.