Phoenix and the frost palace

"Twelve is now a full-fledged hunter, with a new name worthy of her fiery powers: Phoenix. But with her new powers come new responsibilities. When a plea for help arrives from the long-lost witch clan, it's clear Phoenix's newfound fire is their only hope. Phoenix and her friends must travel to Icegaard, the witches' home, to combat the mysterious darkness there--one that grows stronger each day. But deep within this darkness lies an enemy that could destroy Ember entirely--unless Phoenix can find the strength to stop it"--OCLC.