A family of nice ghosts protects a British orphan from the diabolical plans of his evil guardians. When orphaned Oliver Smith inherits gloomy Helton Hall, his scheming cousins are determined to get rid of him and hire some terrifying ghosts from the Dial-a-Ghost agency to scare Oliver to death. But the creatures don't behave as expected, and soon join Oliver against his cousins. However, they may have all underestimated the depth of the cousins' evil intentions.