Cousins Grace (Jeanne Arnold) and Freddie (Terry-Thomas) are furious that the American Munsters are getting the manor, and that Herman will be Lord Munster instead of Freddie. Grace and Freddie, with the help of Lady Effigie (Hermione Gingold), try to get rid of the Munsters, so the estate can be theirs. The American Munster couple feels right at home when Herman's English relatives try to scare them. Freddie disguises himself as a ghost, but screams and runs away when he encounters Herman. Grandpa sneaks out of bed to find out the secret of Munster Hall: a counterfeiting operation is at work in the basement.