From IMDb:
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. Plot keywords include:
Missing Person
[youtube=425,350]http://www.youtube.com/watch?v=uN86SzY5RCk[/youtube]