Young Heimdall must embark on a mighty quest to save Odin - and all of Asgard - in the first heroic fantasy novel set in Marvel's incredible Legends of Asgard. It's a dark time for Asgard. Trapped in an enchanted Odinsleep, the Allfather inspires an all-out attack from the Frost Giants. They evade the gods' defenses with unusual ease, as if guided by omens. Heimdall, a bright young warrior still finding his place among the defenders of Asgard, believes it is no coincidence that Odin lies under a spell and that the Giants are so well informed. He sneaks into Odin's inner chambers and discovers that the severed head of Mimir, a great source of wisdom, is missing. Accompanied by his sister, Lady Sif, Heimdall must cross the Ten Realms to retrieve it, or else the mighty Asgard will fall.