A man known as the Light Keeper, who lives alone in a mountain cabin above Denver, spends his time watching over the city and observing the lighted world around him. Rezzie, a young painter living in Denver, visits him, hoping he will help her find a sense of balance in her life. Following their initial encounter they begin a correspondence that touches on their shared fascination with painters, music and the nature of light. They send each other postcards with reproductions of art by Van Gogh, Monet, Morisot, Manet, Rothko and others, as their lives slowly intertwine.