夜色沉沉，突如其来的脚步声让人心惊肉跳，仿佛黑暗中藏着未知的恐惧。见习女警

　　A pathologist, Dr. Warren Chapin (played by Vincent Price), discovers that the tingling of the spine in states of extreme fear is due to the growth of a "tingler"—a spinal parasite which can kill the host unless it is destroyed by screaming.