The Great Orme: A Locked Room Mystery

Supposing, when you were younger, you and your friends saw what you believed was a great act of cruelty, and decided to mete out your own brand of justice. And further suppose that, as you all get a little older, your friends find themselves in difficult situations and turn to you for advice, advice which inevitably leads to death. What then, do you suppose, would happen if you told your friends that it is time for you all to face up to the consequences of your past actions?
That is exactly the situation Zachary Llewellyn finds himself in, in The Great Orme.
I loved this book, which is set in Llandudno. The Great Orme features extensively, and why not, it is a brooding presence in the town.
There is a sense of menace throughout the story. Some clever plot twists and shocking revelations make this a sinister but very gripping read.