Beyond the Tunnel by Daniel Mitton
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Blurb: Adam Stephens is a man with a mission. It has been three years since they chopped that malignant brain tumor out of his head, and he is off on a solo motorcycle camping trip through the Appalachian Mountains.
When he rides into the Pine Mountain Tunnel in North Carolina and rides out into another realm—a realm that comes complete with a big sexy grizzly bear shifter, mages, and an evil sorcerer—he isn’t sure he isn’t lying in the tunnel after crashing his bike. Can such a world exist? Or is he dreaming? If he is dreaming…it sure is realistic.
Along the way, there will be some major hurdles to surpass including no indoor plumbing…and no coffee. A man needs some basic luxuries, correct?