在这部忍者面具片中,他们的报复是无情的，他们的方法是例行公事，他们的武器是秘密，动机已经流淌在他们的血液中。
在繁茂的私人房地产马利布山，百万富翁兼首席执行官贤治武雄和他的女儿Miko准备迎接从日本抵达的贤治武雄的夫人久美子。 但是，平静的夏至峡谷被打破了宁静，一名蒙面忍者刺客攻击了武雄家里。瞬间武雄的警卫就被打死。武雄也死亡了。第一个到达那血腥现场的是侦探杰克贝瑞特（卡斯帕范迪恩，星河战队），他遇到了Miko（克里斯蒂吴，捉鬼者巴菲），剩下的唯一目击证人。在Miko的休克状态，她只重复一个字，像一个怪诞的口头禅： kokushibyu 。 在她的母语，这意味着黑死病。
Their vengeance is relentless, their method is ritual, their weapon is secret, and the motive is in their blood. In a heavily wooded private estate in the Malibu Hills, towering above the tumbling Pacific, millionaire CEO Kenji Takeo and his daughter, Miko, prepare for the arrival from Japan of Takeo's wife, Kumiko. But the calm of Solstice Canyon is shattered by a meticulously planned stealth attack on the Takeo home by a masked band of ninja assassins. In a flash, Takeo's guards are killed. The mansion is overtaken, Takeo is killed, and Miko is left for dead. Arriving at the bloody scene is Detective Jack Barrett who encounters Miko-the only living witness. In a state of shock, she repeats only one word like an eerie mantra: kokushibyu. In her native language, it means Black Death.
