In their fifth adventure, Rosalind Bernaud, an artist/photographer from Brisbane, and Edinburgh archaeologist Philip Trevasco travel to Cornwall to help his uncle Jeremy achieve his dying wish: to find King Arthur's grave and the site of the Holy Grail. Their modern story is set in 1970s Britain while the ancient recreates the world of Arthur, Guinevere, Merlin and Mordred. Can Philip and Ros win against adverse nature and fragmentary evidence? Will her 'feelings' about the past reveal the identity of Justin? How do the tinners guide both stories to the conclusion?