On the morning that will mark the end of the world they have known, Molly and Niel Sloan awaken to the drumbeat of rain on their roof. It has haunted their sleep, invaded their dreams, and now they rise to find a luminous silvery downpour drenching their small California mountain town. A strange scent hangs faintly in the air, and the young couple cannot shake the sense of something wrong. As hours pass and the rain continues to fall, Molly and Niel listen to disturbing news of extreme weather phenomena across the globe. Before evening, their little town loses television and radio reception. Then telephone and the Internet are gone. With the ceaseless rain now comes an obscuring fog that transforms the once-friendly village into a ghostly labyrinth. By nightfall the Sloans have gathered with some of their neighbors to deal with community damage ... but also because they feel the need to band together against some unknown threat, some enemy they cannot identify or even.