The Gates of Hel: Eschaton Cycle (Gods of the Ragnarok Era)

No one returns from Hel. Hermod aims to change that. With Baldr’s death, Ragnarok has begun. Now, Odin has one last desperate gambit: to send Hermod to the farthest reaches of creation to bring back his son’s soul. The son of a valkyrie, Hermod alone can make such a trek. But to do so he must descend into horrors beyond imagination. But even if he makes it there, can he make back? Hermod aims to change that. With Baldr's death, Ragnarok has begun. Now, Odin has one last desperate gambit: to send Hermod to the farthest reaches of creation to bring back his son's soul. The son of a valkyrie, Hermod alone can make such a trek. But to do so he must descend into horrors beyond imagination. But even if he makes it there, can he make back?--Amazon.com