Piperka

The Old West has been overrun by lycanthropes, creatures that transform into wolves every night and terrorize the human population. A group known as "The Nightriders" has formed to deal with the threat, but even with their special skills they are no match for the rapidly spreading curse of the werewolf. Now one girl holds the key to the survival of mankind; however, she is reluctant to use it when she knows that it might mean the end of her best friend's life.