There is a relation between brain development in children and the acquisition of the five subcomponents for a mature conceptualisation of biological death: Irreversibility, applicability, inevitability, functional cessation and casuality. Current theories propose that knowledge (among them about death) is acquired through a series of confluent waves with advances and setbacks, thus explaining the important differences encountered among children of the same age and good intellectual development. Generally speaking children under four years of age do not have a consciousness of death. They later discover, albeit with difficulty, the concept of irreversibility and much discussion exists about the order in which the remaining concepts are acquired-which is related to incorporating dualistic thought and a degree of biological understanding. There is no agreement on the influence culture, socioeconomic background and previous experience of deaths in the family may have. The mature concept is thought to be acquired around the age of 12. We look at the inclusion of supernatural elements in classical and current chidren's literature, proving that is more prevalent in western literature in the 21st century.