An inexperienced backpacker chooses a remote, unmarked basin in a wilderness area as his late-summer, hiking destination. Against his better judgment, he decides to make the solo hike on his four-day Labor Day weekend, a time of year known for early winter storms. Too late he discovers there's a reason the maps don't show trails into the region and he finds a mysterious cavern that has secrets. Will he survive the ordeal? If so, will it change his life?