Lighthouses and the lives of the men who tended the lamp to keep others safe have captured the imagination of successive generations. Stories  are told of the hardships, particularly in war time, and of the lost cargoes and wreckage they would encounter. The most mysterious story of all is set in December 1900 when three keepers disappeared from the isolated Eilean Mor Lighthouse on the Flannan Isles. In spite of many theories no trace of the keepers has ever been found. A tragic event that encapsulates the hardship and danger associated with keeping the light burning.