As a form of historical novel, this work draws on recorded information about real archaeology, real people and real events. However, some facts have been altered to suit the author's literary purpose, as he freely admits. In an author's note, he states that "Certain changes have been made for dramatic effect". Soon after he adds, "Any mistakes, of course, are entirely my own" (p. 233). The story is told through several voices, so that at each stage it is that individual's knowledge of events which is being represented. This allows the author to present data selectively.