Pierre Salas

Denise, a young employee of the mine, is courted by the engineer Risay while she is engaged to Daniel, a simple underground worker. A betrayal has occurred that compromises the mine. An accident occurs and about fifteen workers, including Denise's fiancé, are buried under rubble in a collapsing shaft.

The inhabitants of the windswept island of Sein, in the nineteenth century, in Brittany follow their own religion without need for clergy, but as strangers arrive, their faith and beliefs face a deep crisis.