Two New Orleans detectives become embroiled in a centuries-long feud between two secretive factions of vampires while investigating a runaway child's case. Torn between their everyday lives and the dangerous lure of immortality, the detectives must race to destroy the evil Moldero clan.

在美国路易斯安那州的巴吞鲁日市，一研究生化武器实验室不幸将一病毒泄露出去，造成该市大批平民被感染成僵尸。而事发时，副总统正在该市进行竞选演讲，因此海军一海豹突击队奉命去营救副总统。因该市一中情局实验室的科学家能成功阻止此次病毒蔓延，故海豹突击队在将副总统送上直升机后，又被赋予新的任务，去营救那名女专家……