Book IV of Children Of The Lamp.  Djinn twins John and Phillipa, with their friends, are in a race against time as they attempt to save their mother from her destiny as the Blue Djinn of Babylon, their father from an ageing curse and museums worldwide from unexplained robberies and bizarre hauntings. Not only all that, an evil force has awakened the ancient Terracotta Warriors and a spell has been cast possessing the soldiers with wicked spirits. Cover art by Petar Meseldžija