'When Charles Lawson aka "God" is 40 and enjoying a prestigious academic career, he goes to Maralinga, South Australia, to investigate the authenticity of a mysterious coin found there after the British atomic explosions of 1960. Here he meets handsome, 25-year-old James (Jamie) Stanborough, who seduces Lawson for his own ends.'
Source: Publisher's blurb.
Author's note indicates that it was republished in Dropping Out : A Tree Change Novel-in-stories: not listed in table of contents under this title.