“El poder de las tinieblas” (Power of Darkness) is a film based upon a famous novel by argentinian writer Ernesto Sábato INFORME SOBRE CIEGOS. Its plot is simple and powerful: a person begins to believe that every blind man he sees is persecuting him. This fear is gradually growing to reach unexpectable points. The plot is ok, but actors are not playing good enough and, therefore, the film is not so good as the book. Anyway, I think it is a good defy to comprehend some of the not always successful relationships between literature and cinema.