When the Mystery Machine becomes stuck, they encounter a pair of scared household servants. They are then helped out by a very strange man who takes them up to the home of the Addams family. They end up taking care of the household while Gomez and Morticia go on a small vacation and Wednesday is kidnapped and a ransom note left behind.

When the hopelessly lost members of Mystery, Inc. enter Moody Manor to ask for directions, Don Knotts, the world's greatest detective, mistakenly believes that they are the relatives of the estate's wealthy late owner. Don suspects that one of them murdered Captain Moody!