Spine and corners bumped.
Clarig, that fascinating spot on the coast of Sutherland, where Alison and her brother Niall and their friends seem to find plenty of excitment at any season, provides not only ample open-air fun and adventure at this particular Christmas-time, but another mystery to unravel. Is the Professor's interest in geology genuine? If so, why are some of his movements so suspicious? And how is it that both Alison and her uncle have a feeling that they have seen him before? Events prove that not rocks, but something very different, are behind the Professor's activities