Reality is unraveling in the dusty Colorado town of Castle City. Strange symbols are carved into storefronts, and ancient legends come to life. Saloonkeeper Travis Wilder is handed an ornate iron box and a mysterious mission. And in Denver, where dead men walk, ER doctor Grace Beckett is witness to a terrifying and inhuman scene of carnage. Theirs is a destiny shrouded in a coming darkness, a destiny that draws them into the otherworld of Eldh....

Eldh is a land of gods and monsters, myths and runecraft, conspiracy and blood. It is a world that has secretly coexisted beside ours for millennia. But now the boundary between worlds is crumbling in the face of a monstrous evil. And if Travis and Grace cannot save this strange land, then both worlds may pay the price.