Furious that her late father only willed her his gloomy-looking mansion rather than his millions, Carrigan Crittenden ... and soon Kat meets Casper, the ghost of a young boy who's "the friendliest ...

After the Harvey's go on vacation, Casper's human friends throw him a party to cheer him up but a revived Carrigan turns them into ghosts, using a magic spell from an old book in the library ...