Conclusion to the Green Lion Trilogy. - The Treacherous Princess Diaspad, twice thwarted in her designs on the throne, has at last found the weapon she craves: the sacred stone of Caer Cadwy. With the secrets contained in an ancient grimoire, Diaspad can transform the stone, source of Celydonn's tranquility, into a terrible force for destruction. The battle lines are drawn. Now comes the hour that Teleri, the Queen's sorceress, has trained her entire life to meet.