I remember thoroughly enjoying this story when it first aired on NZ tv, who knows how many years ago now. The characters of the Fourth Doctor and Leela really have a good rapport; there is wit, tension and lots of good old-fashioned running around chasing monsters.
The Doctor and Leela are on their way to Brighton, but unfortunately end up on Fang Rock, a barren island with only a lighthouse and three lighthouse-keepers. Along the way, an aristocrat's yacht is washed ashore on the rocks, and the remaining passengers and one crewman are added to the small number of people stranded on the island. But is there something or someone else on the island with them all? And what could it possibly be doing there?
The characters of the lighthouse-keepers are well played in this story, and the aristocrat, his military companion and secretary, as well as his man Harker are also integral characters in the story. The Doctor and Leela find themselves having to fight prejudice and superstition, as well as greed, ambition and the unknown assailant in this desperate fight to survive.