Stone Heart: Heart of the Staff
Demonica learns that her granddaughter Spitemorta, the queen of Goll, has the lost Staff of Power. She becomes Spitemorta's son's nanny and offers to teach her how to develop her powers. Spitemorta accepts, thereby uniting the two most dangerous sorceresses of the age, determined to conquer the world. Their first step is to find the Stone Heart, making the Staff the most powerful tool of all time.