Plot Summary:Is becoming a woman analogous, in some deep psychological way, to becoming a werewolf? Ginger is 16, edgy, tough, and, with her younger sister, into staging and photographing scenes of death. They've made a pact about dying together. In early October, on the night she has her first period, which is also the night of a full moon, a werewolf bites Ginger. Within a few days, some serious changes happen to her body and her temperament. Her sister Brigitte, 15, tries to find a cure with the help of Sam, a local doper. As Brigitte races against the clock, Halloween and another full moon approach, Ginger gets scarier, and it isn't just local dogs that begin to die.
碧姬(艾米莉·帕金斯 Emily Perkins 饰)和金杰(凯瑟琳·伊莎贝尔 Katharine Isabelle 饰)是情同手足的姐妹,彼此之间感情十分亲密。某日,金杰外出意外遭到了一只怪兽的袭击,好在虽然身受重伤,但好歹捡回了一条性命。然而,令碧姬感到担心的是,自此金杰的性情大变,日渐放荡狂野,不仅四处沾花惹草,甚至开始渴望鲜血的滋味。 让碧姬感到更加恐慌的是,她发现金杰身上已经愈合的伤口之上竟然长出了褐色的毛发,而她的尾椎骨上亦身处了类似尾巴一样的部分。无法对此坐视不管的碧姬找到了喜欢研究植物的山姆(克里丝·莱切 Kris Lemche 饰),希望后者能够研制出解药,让金杰变回原样。