Three children. Two universes. A wolf-lord desperate to save his world.

Schoolboy Connor has suffered a tragedy. His scientist father, Perry, has disappeared mysteriously in the remote wilderness region of Ireland while re-wilding the area with wolves. The shock has turned Connor blind, but then Connor discovers he has the gift of inner sight: he can see with his mind.

Soon after, he begins seeing a fearsome yellow-eyed wolf peering at him from his wardrobe doors, and nightmarish creatures battling under his bed. After the waking dreams become reality, the wolf whisks Connor and his two pals Evey and Billy through a portal in his wardrobe, to the wolf citadel of Lupusopolis, which is under attack by hideous forest creatures under the leadership of a human man named Peragrim.

Connor assumes the role of a wolf-spy because of his special gift. But can he and his friends bring peace to the warring factions, or will an epic battle be inevitable?