Epsilon Forest - Ruy Burgos-Lovece - Bog

This is the story of an otherwise unremarkable man who gets thrown into a supernatural world where he must walk in the rain down a winding path to nowhere through a forest of towering trees. Most of the time, he walks alone carrying an M-16 rifle, but there are other people and life forms in the forest, and he interacts with them in different ways. From time to time, he's transported back to normal space.