May, 1831, and on a tiny island off the Isle of Man a lighthouse provides a harsh living for an unusual family. Safe from the disapproving eyes of polite society, Lucy and Diya, sisters-in-law with three children between them, watch over the ancient light on Ellan Bride. But the Scottish lighthouse engineer, Robert Stevenson, is making his name building the remarkable Bell Rock light, and Ellan Bride is under threat—and the future of the family hangs in the balance.
When Archie Buchanan and Ben Groat arrive to assess the Ellan Bride light, they find themselves in the midst of a charged atmosphere, and emotions escalate to a danger point. No one is prepared for the outcome.