Escaping the battle of Birling Wood, Sam and Emily move deeper into Northumberland, still pursued by dark forces seeking the last Druid, heir of a mysterious order which has protected this world and others for millennia. But who is the last Druid? And who will find them first? The Shadow? The Grim-Witch and her horde of crow-men from the Underland? The risen dead? Or the terrifying Shadow Ruins?