The Bad Seed — Louise Cooper

Brother and sister Marloe and Silve are children of a burgeoning and powerful dynasty. Their mother, Shar, was a prodigiously powerful channeller of supernatural forces as a child, and their father, Kitto has an almost telekinetic affinity with animals of all kinds. Now, Marloe and Silve have come of age. As teenagers they are beginning to understand exactly what gifts they have inherited from their parents. And now they are faced with their first deadly challenge when a century-old sorceress kidnaps their dear friend Jianna, with a plan to channel her own particularly twisted brand of magic through the girl. Jianna will be left an empty shell, if Marloe and Silve cannot find her in time. It will take every ounce of their powers, and will find them tackling spirits and entities on a terrifying scale. But they must find the courage and take on evil, to claim back good...