Marvel Untold Novel Softcover Three Swords

While helping some rebels overthrow their tyrannical king, the Warriors Three meet an old mystic who claims to have been waiting for them. He describes to them the threat posed to Asgard by three sorcerous brothers, the Enchanters, who are each working to create an army to conquer Asgard. But the Enchanter's towers are scattered across time and space, and the Warriors Three will have to risk life and limb to stop these sorcerers before they can overthrow Odin's rule. But things are not quite as they seem, for in the shadows, someone is plotting against these heroes.