Ginger Snaps is one of the best revisionist horror movies I've seen - if you liked "Ravenous" you'll enjoy this. Contrary to a previous reviewer's remarks, the film is not heartlessly "cool" - no chilly hipster would be capable of the compassion this film shows to its outcast, unbeautiful characters. Like all the best horror films, the true subject of fear is very real - the earthquake effect of sexual maturity on teenagers, girls in this case, and the disruption of sibling relationships by differing levels of sexual maturity. It also speaks to a genuine post-Columbine concern. When youth culture admires alienation, morbid affectation and misanthropy, how can genuine psychosis be distinguished from acting out? The highest praise goes to Isabelle and Perkins, whose characterisation is superb. Mimi Rogers as the mother who raises denial to an art form is also excellent.
On the downside, the last twenty percent of the film declines into cliched stalk-and-slash, with typically idiotic behaviour by previously intelligent characters, and an embarrassingly polymeric monster. The humanoid werewolf makeup is so derivative of "Buffy" I'm surprised Optic Nerve didn't sue. Moreover, for its revisionist pretensions, the films underlying attitudes to sexuality are disappointingly regressive, as are the final fates to which it consigns its characters.
On balance though, highly recommended.