Sergei Bodrov's Seventh Son conjures a medieval world of witches, monsters, and dark prophecy. Jeff Bridges stars as a grizzled "Spook" training a young apprentice (Ben Barnes) to battle supernatural forces led by Julianne Moore's powerful witch. Blending High & Epic Fantasy and Sword & Sorcery, the film delivers sweeping battles, mythical creatures, and gothic adventure rooted in medieval folklore.

Från IMDB:
When Mother Malkin, the queen of evil witches, escapes the pit she was imprisoned in by professional monster hunter Spook decades ago and kills his apprentice, he recruits young Tom, the seventh son of the seventh son, to help him.