When Baron Morgarath escaped to avoid punishment for treason, an uneasy peace fell on Araluen. But the Rangers know Morgarath will be planning his next move. King Duncan must prepare for war.

Halt volunteers for a seemingly impossible task - climbing the deadly cliffs of the Mountains of Rain and Night and venturing deep into enemy territory to spy on Morgarath. Meanwhile, Crowley must ensure the Queen's safety as she undertakes her own perilous journey for the sake of her unborn child.

Morgarath's force of savage, inhuman Wargals seems unstoppable against Duncan's depleted army. One wrong move could mean defeat. At the Battle of Hackham Heath, the fate of a Kingdom will be decided.

The origin story of how Halt came to be Araluen's most famous Ranger - and how war will shape the future of the next generation - will thrill Ranger's Apprentice fans and new readers alike.