The Valor of Valhalla by Martin Kearns

Genre: Dark urban fantasy

Beneath the Veil (The Valor of Valhalla #1) - Blurb

In a battle between two ancient evils, can one naïve young man become the last hope against powerful creatures of legend?

David Dolan thinks he's already got the world figured out. But when a collapsed bridge plunges him into the icy Hudson, he's pulled deep into the deadly realm that exists between life and death. And with his earthly form trapped in a coma, he's vulnerable to the horde of demons hell-bent on his utter destruction.

Traversing the road to the afterlife, David seeks the wisdom and skills he needs to fight the demonic forces reigning havoc on his allies above ground. But as one hellish threat closes in on his defenseless body, David must defeat another terrifying fiend waiting in the shadows to use him...

Can David escape the world beneath the veil in time to stop the bloodshed?