Christmas is special for psychic Nan Killian, medium Sarah Lyon-White and their ward Suki. It is special for their friends, Doctor John Watson, and his wife Mary, both Elemental Masters, who have found great delight in the season seeing it through young Suki's eyes. But Christmas Eve is also hallowed to dark forces, powers older than mankind, powers that come awake on this, the Longest Night. Women disappear in the dark of night, women only missed by those of their own kind. When they start to reappear, they are no longer sane. When the shadows reach for girls of good, can they stop the darkness before it can conquer all?