By means of honouring the memory of Denis Diderot on the occasion of the third centenary of his birth in 2013, I wished to present this short novel, as if this was his unpublished manuscript which was discovered today, accompanied by a letter sent to his beloved Sophie Volland, wherein Diderot retells his dream. The letter is dated Paris, 20th September 1769, few days after Diderot actually wrote his work entitled: The Dream of d'Alembert. With this imaginary literary discovery, I desired to bring back to life the contemporaneity of the eternal universality of thought of the great philosopher. Walter Noetico