When Susanna Shaw took an assignment from her magazine editor to be a "Keeper For A Week" at a lighthouse off the coast of Maine she thought she was in for a relaxing vacation. Secluded on a private island, the Cape Elizabeth Lighthouse is legendary around the sleepy little town. Renowned for its beauty, the lighthouse is also known for the magical beam that comes on by itself at night for one single rotation before going dark again. As Susanna settles in, she is prepared for her adventure and for a week of isolation ... She is not, however, prepared for the mysterious man that has waited over a century for her arrival.