The Ruins of Karnak

From publisher blurb: Little did the Karnak family realise, when they built their castle on the summit of Karnak Tor, that the hill wasn't a hill at all but a dormant volcano. Thus was the Karnak's occupation of their castle short lived. Today the once splendid home of the Karnaks lies in ruin, abandoned and shunned even by the local banditry who dare not dwell there for fear of the volcano. But rumours abound. Whatever happened to the wealth of the Karnaks? And why do locals talk recently of smoke rising from campfires amidst the ruins?