Guilt-ridden at the number of men dying in her father's tin mine, Grace Damerel works hard to help the village's bereaved families, while caring for her frail mother and preparing for her brother's homecoming. The arrival in Treworthal of Edwin Philpotts, a former missionary, ignites a dramatic sequence of events that brings to light long-buried secrets. But, what is the reason for Edwin's return to Cornwall and how will Grace respond to his shocking confession?