内容简介：
Its kind has hunted since the dawn of mankind. Efficient, lethal, and in the shadows of the world, unseen, it pursued predation in a way unparalleled by other creatures. From it grew stories, at first whispered from villager to villager, from mother to recalcitrant child, from clergy to frightened flock. The stories lived and grew, becoming legends only dimly connected with the truth of their origins. Doctor Janis Michaels, smart, modern aspiring cardiologist, knew her craft well. Hard work was her credo and preparedness her style, yet her destiny was soon to intertwine with an ancient force she had absolutely no knowledge of. It was a force from the shadows of time living in the shade of today. And it hunted still.