October 1300: 'The Waxman', most feared of war cogs, is carrying 'The Cloister Map' - an ancient manuscript alleged to chart the whereabouts of a legendary treasure - when it is overrun by ships flying the colours of the Hanseatic League. December 1303: Wilhelm Von Paulents, a representative of the Hanseatic League, arrives in Canterbury in possession of 'The Cloister Map'. Sir Hugh Corbett is sent, by Edward I, to negotiate for ownership of the chart. But shortly after his arrival, Von Paulents and his companions are assassinated. How could this happen when they were under city guard? Even more puzzling is the fact that 'The Cloister Map' has not been stolen. Now Corbett must uncover why the murders were committed. Is this revenge for past deeds or the actions of a killer in love with death...?