A Study in Sorcery is an alternate history novel by Michael Kurland featuring Randall Garrett's fictional detective character Lord Darcy. It was first published in paperback by Ace Books in 1989. The Lord Darcy stories are set in an alternate world whose history supposedly diverged from our own during the reign of King Richard the Lionheart, in which King John never reigned and most of western Europe and the Americas are united in an Angevin Empire whose continental possessions were never lost by that king. In this world a magic-based technology has developed in place of the science of our own world. Source: Wikipedia (en)