After a vampire murders a young couple and assaults the surviving girlfriend, she gives birth to his half-vampire son, a child who can survive only on blood, which she supplies from her own veins for years afterward. Decades later, the grown son enrolls in a college folklore class to hunt down his vampiric father, unaware that the professor teaching it is his father in disguise, leading to a confrontation that leaves the son's own fate disturbingly uncertain.