In 1893 Cornwall, a doctor is sent to investigate a miraculous claim that a fisherman's wife has cured tuberculosis, but what he discovers is more than he can believe.

Single mum Rachel is on the poverty line, leaving her working all hours of the day as a cleaner to provide for her son. Out of the blue, she is approached by a wealthy businessman offering her a new job with better pay and shorter hours. However, after accepting she gets drawn further into his life and begins to question his motives.