Footprints of the devil - Olive Etchells

This is a murder mystery set on the wild Cornish coast. Championship surfer Dave Treganza returns to his native Cornwall for a surprise visit, only to find his sister-in-law and aunt in turmoil because Jonathan, his brother, has disappeared without a trace. And then, several days later, Johnny's murdered body is discovered down a derelict tin mine. The mine is within a few miles of the huge earth satellite station at Goonhilly Down and the police suspect a link between Johnny and the site. DCI Channon, who has had previous experience in suspected sabotage, is called in from the adjacent police authority to help in this investigation. The investigation proceeds without success, and then another murder occurs, devastating yet another family. And DCI Channon and his assistant, Sargeant Bowles, two very different men with clashing personalities, must work together to finally unmask a killer.