Servant of the dragon

In the third book of Drake's LORD OF THE ISLES series, the young King Garric is faced with all the burdens of kingship. Guided by the ghost of King Carus and the help of the soceress Tenoctris, Garric should have few problems. But a threat emerges from the past - the Wizard Purlio seeks to conquer the future with an army of the dead. And Garric's sister Sharina has gone missing, abducted through time itself by a gigantic bird. And if Garric hopes to defeat the dead, he must become one of them . . .