The guys are back for a thrilling new season of unsolved mysteries, unexplained phenomena and true crime as they journey into the world's most notorious death forests, from the cursed Aokigahara Forest in Japan, believed to be a "world navel" linking Earth to the afterlife, to Russia's Mountain of the Dead and Valley of Death, and Australia's mysterious Black Mountain - regions marked by unexplained extraterrestrial activity, strange disappearances and disturbing deaths.