Young Ivor dreams of being a swordsman like his nine older brothers, but until he can grow a beard he's limited to being a runner, carrying messages for their lord, Thane Carrak. That's usually boring, but this time Carrak has sent him on a long journey to summon the mysterious Rorie of Ytter. Rorie is reputed to be a wizard—or an outlaw, or maybe a saint—but the truth is far stranger, and Ivor suddenly finds himself caught up in a twisted magical intrigue that threatens Thane Carrak and could leave Ivor himself very dead.

Earl Malcolm has reason to fear the ferocious Northmen raiders of the Western Isles are going to attack the land of Alba, so he sends Ivor on a desperate mission with a chest of silver to buy them off. But the situation Ivor finds when he reaches the Wolf's Lair is even worse than he was led to expect. Only a miracle can save him now.

When the wyrd-woman warned Ivor he was going to meet a monster, he didn’t believe her. He thought he had worse things to worry about. He was wrong about both.