The Hungarian-born Austrian writer Rudolph Lothar wrote the comedy play Der Werwolf in German in 1921, under the pseudonym "Angelo Cana".

However, when the Duchess attempts to prove the possession by a rendezvous with Moreira, she finds that he is no libertine; instead she discovers that the culprit seducing the servants is her butler, Vincente.

It is a parallel to the use of the term "vampire" to refer to a dangerous woman who seduces men, which was a common trope in plays and movies of the era.

[9] Theatre Arts Monthly said Unger made "amusing and satirical" use of psychoanalysis as a plot device, but the result was mostly sexual innuendos without any other significance.

[10] In Variety, Robert Sisk condemned the innuendos more vigorously, calling the play "an exhibition of slimy, putrid filth" that wasted the talents of an excellent cast.