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From the liner notes

Derek Washington, a cop with a vengeance, must travel to the dark side and become the one thing he hates the most when a botched sting operation leads to the discovery of a deadly vampire who leads the undead. Seeking out the help of one of the last vampire hunters, Master Kao, Wasahington begins his training - determined to hunt the ultimate killer. Vampire Assassin was probably a better movie When it was called Blade.