Ginger Snaps is a 2000 Canadian horror movie about two close teenage sisters (Katharine Isabelle and Emily Perkins), who are obsessed with death. One day in early October, Ginger is bitten by a werewolf and her sister must try to save her life, before the transformation becomes complete, by the end of the month. The movie is followed by Ginger Snaps 2.

Related Link: http://www.imdb.com/title/tt0210070/