But as winter stretches on, and the unending ice refuses to break, terrible acts of treachery soon make it clear that a traitor lurks in their midst. A malevolent air begins to seep through the fortress walls, and a smothering claustrophobia slowly turns these prisoners of winter against one another.Those charged with protecting the king's children are all suspect, and the siblings must choose their allies wisely. But who can be trusted so far from their father's watchful eye? Can Solveig and her siblings survive the long winter months and expose the traitor before he succeeds in destroying a kingdom?

    To renew it, goblins must perform an ancient ritual involving the rarest of their kind—a newborn changeling. But when the fateful night arrives to trade a human baby for a goblin one, something goes terribly wrong. After laying the changeling in a human infant’s crib, the goblin Kull is briefly distracted from his task. By the time he turns back, the changeling has already perfectly mimicked the human child. Too perfectly: Kull cannot tell them apart. Not knowing which to bring back, he leaves both babies behind.Tinn and Cole are raised as human twins, neither knowing what secrets may be buried deep inside one of them. Then when they are twelve years old, a mysterious message arrives, calling the brothers to be heroes and protectors of magic. The boys must leave behind their sleepy town of Endsborough and risk their lives in the Wild Wood, crossing the perilous Oddmire swamp and journeying through the Deep Dark to reach the goblin horde and discover who they truly are.