The Apples of Idunn - Gods of the Ragnarok Era, #1

Driven to become king. Fated to be a god. In the cold winters of an ice age, Odin was born to be a mere jarl. But Fate has staked a claim upon him. When his brother falls under a ghostly curse, a goddess offers Odin a chance to save him. If Odin can make himself king-and promise an unspecified favor-she will make him and his family immortal. In desperation, Odin begins a quest to become king of all the Aesir.
But his journey exposes him to forces more powerful than even the goddess: the Norns who foretell Fate. They warn of a terrible burden he will bear, and of the coming end times, Ragnarok. Tormented by his prophetic dreams, Odin must soon choose between those he loves and a fragile chance to avert Ragnarok.