Siblings Tom (Harold Pruett) and Jackie (Gail O'Grady) win a sweepstakes allowing them to compete in a scavenger hunt in an Italian castle for a million-dollar prize, but the eight contestants become the hunted when a supernatural evil is let loose. Along with faded rocker Cassandra (Bunty Bailey), Tom and Jackie learn that they're being tormented by the nefarious Señor Diablo (Adam Ant), who concocts ingenious deaths for the competitors.