A young age to a teenage girls comes with a throwback terrifying in this fascinating story about the legend of the werewolf. From birth, Anna (Bel Powley) has been raised in isolation by a man who knows him only as dad , who did everything possible to hide the truth about the origins of the girl . But when teenage Anna is suddenly pent up in the real world, under the protection of the police officer Ellen (Liv Tyler), it soon becomes clear that the young woman is far from ordinary. Impossible to adapt to a normal life, Anna is in place the freedom of the wild of the forest, while struggling to resist all the temptation. This thriller full of atmosphere, combine supernatural spirits with a story of self-discovery similar myths.