Book, Sign of three, O[LS]

Language: Brazilian Portuguese. How do the sharpest detectives solve their cases? What thought processes guide your incredible solutions? How do they manage to lift the clues of the invisible in the world from the tips of the visible? On the horizon of these three questions, a repertoire of questions is projected that extends in its logic, from the police investigation to the epistemological inquiry. To meet their challenge, Eco and Sebeok, the judges, hired the services of an unusual team of experts: Peirce, Holmes and Dupin.