Simon Raven 
September Castle 

Basic human desires merge with the occult in a complex and erotic tale of a hunt across Europe. Ptolemaeos Tunne is determined to discover a hoard of valuable buried treasure. His only clue is a bizarre medieval legend about a possessed Greek princess with a bad reputation. What he doesn’t know is that his sixteen-year-old mistress Jo-Jo has unwittingly betrayed him to some very dangerous enemies.