Blithe Spirit (1945)

"Elvira is the kind of gal who can turn an evening into a night you'll never forget!"

An English mystery novelist invites a medium to his home, so she may conduct a séance for a small gathering. The writer hopes to gather enough material for the book he's working on, as well as to expose the medium as a charlatan. However, proceedings take an unexpected turn, resulting in a chain of supernatural events being set into motion that wreak havoc on the man's present marriage.