19th-c Scotland; Ardnamurchan Peninsula, 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.

A bag of bones is pulled out of the water; and the assistant to Gustav Wengler, eccentric owner of the lead mines, is horrifically murdered. Is there a connection? And what do either have to do with the strange sundial in Ockle churchyard and the weird collection of monuments on Wengler's island known locally as the White Cathedral?

Sholto McKay and Brogar Finn of the Pan-European Mining Company begin their own investigations, when no one else will, unaware their discoveries will tear more than one life apart.

And here comes another man, all the way from Copenhagen, who has his own secrets, and his own riddles to solve.

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