Two of the world's greatest detectives, Auguste Dupin and Sherlock Holmes, explain how to solve really difficult problems. The solution of 'Murders in the Rue Morgue', the 'Hound of the Baskervilles' and other mysteries gives clues as to how to solve past and contemporary problems such as the causes of Renaissance, Scientific Revolution, Industrial Revolution and the Internet. 

Alan Macfarlane is a retired professor of Anthropology at the University of Cambridge and here explains their method to his young friend Sam.