 It is set on the fictional continent of Havilfar as well as the islands of Pandahem and Valka.The 52 completed novels of the Dray Prescot series were written by Bulmer between 1972 and 1997, when a stroke stopped his writing, also the later Dray Prescot books, after 1988, were originally only published in German.The series is in the spirit of Edgar Rice Burroughs John Carter of Mars series.