Dark skies, the incessant rush of waves, days that blend into night: for 1900s-era lighthouse keepers like James Ducat, Thomas Marshall, and William MacArthur, these unforgiving conditions were a way of life. But when these three men disappeared into the grey fog surrounding the Flannan Isles Lighthouse, they had no clue the kind of mystery they would leave behind. It all started with a tragic telegram: “A dreadful accident has happened at the Flannan’s…”

When the Flannan Isles Lighthouse finally came into view, the crew of the Hesperus immediately knew that something was wrong. This wasn’t exactly the kind of arrival they had hoped for in the first place. The trip there had been nothing but disastrous….