When the annual frost-dragon migration fails to happen, Dr. Drake and his apprentices Daniel and Beatrice realise something sinister is afoot - could dark dragonologist Alexandra Goryntchka be up to no good again? The trio head to the Lost Isle of Dragons, where they face grave danger to stop their enemy finding the Hammer of the Dragons: a legendary weapon deadly to all dragons. When they learn of an ancient prophecy foretelling a battle between the powers of good and those who would harm dragons, it seems that age-old rivalries are about to be laid bare. The fourth and final part of the fire-breathing series of novels that are packed with dragons, magic and action-adventure.