A resentful 14-year-old girl is drawn into a seemingly innocent friendship with an older man, but the relationship turns sinister.

Balthazar Blake, an apprentice of the legendary magician Merlin, must train his old teacher's successor - an introverted but resourceful physics prodigy - in the art of sorcery to prevent the return of Morgana le Fay.

When David's sister returns home after a long absence, their complicated past comes back to haunt them.