内容简介：
Percy, Ginny and Mally stumble across two very strange stones and a spear. Ginny suggests they visit the Henley Deep coal mine to search for similar stones. At Sculleyas Bend, they board the coal train Prince Maljo and are shocked to discover its appearance has changed. Waiting for them on the footplate is Maltheus, a wise and magical councillor from the galaxy Orion, sent to earth to enlist the help of Percy and his friends in saving the mineral wealth of the Fertile Crescent from the malevolent Evil One and the war warriors of Zeerabaum. It is a most extraordinary journey of danger and discovery. To survive they must rely on their courage, ingenuity and trust. Percy will discover the special powers gifted to him at birth by Chailleach. These characteristics will be sorely tested, making the children question their unique friendshipa]