Abigail and Beatrix have been adopted y the Malefics, a famous inventor family, after a short stay in the Skipping girl Home for Wayward and Homeless girls in Melbourne. Zarah sets out to be reunited with them, but when she gets to the Malefic Mansion she is disturbed to find that her sisters are nowhere to be seen. Where are Zarah's sisters? Why have other children been disappearing? And what do these happenings have to do with the Malefics' latest invention, The Library of Wonder?Book Two in the Della Mortika series