Dark Fire ( The Last Dragon Chronicles #5) by Chris d'Lacey-Used

David Rain was lost in the Arctic for five years. Now, his daughter, Alexa, has brought him back, but a lot more has come back to Wayward Crescent than just David-for dragons have finally returned to earth as well... Now, David, Lucy, Zanna, Liz, and the dragons of Wayward Crescent must face a more terrifying evil as they fight to restore balance to this world.