You work for a secret organization whose function is to keep the world operating. You do your part by maintaining a lighthouse ... but not in the normal sense of the word. And then one day, the operators of the other three lighthouses hail you over the radio with terrible news ... When the pressure is on to not only survive but to keep your lighthouse in working order, what do you do? This week's prompt comes from Nicole Thomas: "When the last lighthouse in the world went out."