In Los Angeles, Detective Hank Holten is obsessed by his ex-wife, the writer of vampire novels Susan Hastings, stalking her and having drinking problems. His chief and friend, Captain John Billings, makes him promise to forget her and stop drinking, and assigns Hank to find Layla Simmons, who is missing and without notice to her family. Hank goes to a rave party, finds Layla, they go to an orgy party in an old building, and while having sex with her, Hank finds that the place is a vampire nest. He is bitten by the vampire-leader, but nobody believes on him. He looks for Susan to help him. 在混乱的地下世界，参加锐舞派对的人们神秘消失。探员汉克是唯一一个知道这恐怖事件真相的人——吸血鬼们正在捕食派对中的年轻人。当汉克在血腥事件中探究越来越深入，眼前的景象对他的心灵造成了损伤，他的长官开始质疑他是否还精神正常。但是在汉克被吸血鬼头领耍了之后，他必须在吸血鬼造成更多人牺牲和自己失去灵魂前，成为猎人，铲除这些怪物。
