19th century Scotland. Ardnamurchan Peninsula on the west coast is inhabited by mining folk and crofters eking out a living from the unforgiving land, turning a blind eye to the smugglers who plague the coast.

Harold, Simmy's brother, pulls a bag of bones out of the water near his home and, not long afterwards, a man is viciously attacked and left for dead. He is the assistant to Gustav Wengler, eccentric owner of the local lead mines and creator of the strange monuments known as the White Cathedral.

How can they be connected? And what is the relevance of the unusual sundial in Ockle churchyard, well known to both Harold and Simmy?

Smugglers and sundial; a Floating Chapel and a foreigner heading their way from Denmark.

Someone needs to find out what it's all about before more lives, including Simmy's and Harold's, are torn apart.

Gray's richly researched historical crime series will keep readers gripped to the very last page.