In February of 1978, five friends left a college basketball game in Northern California and seemingly vanished into thin air. Months later, four of them were found dead deep in the wilderness, miles from their abandoned car, while the fifth remained missing. Nearly fifty years later, the Yuba County Five remains one of America's strangest unsolved mysteries—a baffling case filled with unexplained decisions, bizarre clues, and theories ranging from tragic misadventure to murder and conspiracy.