The Bitter Stones of Intention — Tony Masero

In the spring of 1882, British mining engineer James September, arrives with his young son in the port of Lisbon. Falsely blamed for a mining accident in England, the engineer is exiled to an isolated silica mine in the Portuguese mountains. He finds that life in the primitive mining village is more than he bargained for, a place where repressed lust and murder have found a home.
A deeply religious man, James must struggle with the consequences of a sinful relationship and the terrible price he has to pay for his transgression. Before long the mountains are set alight with other dangers as Spanish brigands cross the mountains and James and a handful of survivors must escape their wrath.