The Nightmare Man (1981) (Episode 3)

Part 3 of 4 of the eerie thriller. There is yet another death as Dr. Symonds has been brutally murdered, but who is doing it - and why? And there are bizarre discoveries by the police. Radioactivity is discovered on Inverdee; a 'flying saucer' has been sighted, and a strange craft is found on the sea-shore. Are these bizarre incidents connected with the recent killings or red herrings to mislead the police?