Working out of their newly established Headquarters – an old trailer hidden behind carefully arranged junk in the Jones Salvage Yard – and driven around southern California in a gold-plated vintage Rolls Royce they've won the use of in a contest, Jupiter Jones, Pete Crenshaw, and Bob Andrews decide to get publicity for their fledgling detective firm by finding a real haunted house for the renowned film director Reginald Clarke.
But although the highly rational Jupiter starts with the belief that there is no such thing as a ghost, a spook, a phantom, or a spirit, Terror Castle – the old mansion supposedly troubled by the ghost of the late Stephen Terrill, the silent horror film star called the Man with a Million Faces – may prove him wrong!