An Interview with Macbeth takes Shakespeare's play and examines the truth of that story compared with historical reality. The reason for the porter's speech is explained - MacDuff is the instigator of the plot to kill Duncan and arrives so timely in order to incriminate Macbeth as the murderer. Macbeth does not kill Duncan, the actual murderer is Donaldbain (a prince who eventually rebelled against his brother, King Malcolm of Scotland) who is being manipulated by the MacDuffs, who are followers of Wicca. Their intention is to take the throne of Scotland for their own family by marrying Donaldbain to their daughter, meanwhile crushing the Christian church and substituting Wicca as the religion of Scotland. Macbeth manages to derail this scheme, but cannot escape Malcolm's attack on him, which is backed by the English. However, Macbeth manages to ensure that his royal line survives until the present day. The play explores madness and the nature of evil, as well as changing patterns of morality and views of history. An Interview with Macbeth was written to be performed at drama festivals, at which it has won awards, and contains parts for experienced players and young people.