Today I am going to analyze the events of Inferno. What has happened is that what Langdon once thought for sure was cotrovacer turned out to be something else that has yet to be revealed. Dan Brown always had a clever way of making things that you think you knew actually be false. Also recently in the book one of the characters who tried to kill Langdon named Vayentha, was disavowed (to end all ties with) from the Consortium most likely because she had failed to kill Langdon and get the 'object' he was holding. I do not think that is the last we will be seeing of Vayentha, because Dan brown made a whole chapter and a paragraphs about him.