Long before postmodern historical novels such as Italo Calvino’s “Invisible Cities” (1972), Umberto Eco’s “The Name of the Rose” (1980), Christa Wolf’s “Cassandra” (1983), and Salman Rushdie’s “The Enchantress of Florence” (2008) captivated readers with their imaginative, thoroughly researched, and carefully plotted recreation of the past, there was Vera Mutafchieva’s “The Case of Cem” (1967).