Best keep to your Lenten vows or Rougarou will get you.

In rural Louisiana, 11-year-old Sabine's widower father misses Ash Wednesday Mass, so she pushes him to give up drinking for Lent. He breaks his vow, evoking the wrath of the ROUGAROU, a mythical bayou beast who punishes bad Catholics. Now Sabine has to step up to save him from the monster or risk losing her only living parent.