Books with author Rick Vyper

When Cedric discovers an ancient artifact called the Mage Stone lying outside the Torben Dungeon, he immediately shows it to a young Lord Voldemort. Cedric has heard the tales of the Mage Stone's awesome magical powers, and he believes it can help Lord Voldemort become powerful and achieve his destiny a lot sooner. What the two of them don't realize is that the Mage Stone does not give up its secrets so easily, and is a lot more trouble than its worth. They'll need the help of their new friend Shiela Scuttlebrow, a quiet but very powerful classmate, to undo all the trouble that the Mage Stone has caused. The problem is, can even Shiela's help be enough to get them out of this magical mess?