Gilles Deleuze, The Philosophy of Crime Novels (from Gilles Deleuze, Desert Islands and Other Texts, 1953-1974. Edited by David Lapoujade. Translated by Michael Taormina. Semiotext(e) Foreign Agents Series (2004), pp 81–85.) […] In the old conception of the detective novel, we would be shown a genius detective devoting the whole power of his mind to the search and discovery of the truth. The idea of truth in the classic detective novel was totally philosophical, that is, it was the product of the effort and the operations of the mind. So it is that police investigation modeled itself on philosophical inquiry, and conversely, gave to philosophy an unusual object to elucidate: crime. […]  

Gilles Deleuze, The Philosophy of Crime Novels

(from Gilles Deleuze, Desert Islands and Other Texts, 1953-1974. Edited by David Lapoujade. Translated by Michael Taormina. Semiotext(e) Foreign Agents Series (2004), pp 81–85.)

[…] In the old conception of the detective novel, we would be shown a genius detective devoting the whole power of his mind to the search and discovery of the truth. The idea of truth in the classic detective novel was totally philosophical, that is, it was the product of the effort and the operations of the mind. So it is that police investigation modeled itself on philosophical inquiry, and conversely, gave to philosophy an unusual object to elucidate: crime. […]