San Fierre forests are rumored to be full of strange mystical phenomena. Brian and his brother Kenneth, along with cryptozoologist Clyde Vega, search for answers to questions about a mysterious creature called the Thin Man. When they realize they won't make it out alive, it's too late. Sliding deeper and deeper into the abyss of madness, discovering the bloody past of these forests, they are more than certain that this is the last ride of their lives.