This is the third title in the series for young people that focuses on the reinterpretation of Shakespeare's classic and enduring plays. Annie is not a witch, but when her mistress Lady Macbeth calls for a potion to 'stiffen Macbeth's sinews', Annie is caught up in plots that lead to murder, kingship and betrayal. Annie must also not only choose between Rab the Blacksmith and Murdoch, Thane of Greymouth, but discover where her loyalty lies.