It is loosely based on the Aleksey Konstantinovich Tolstoy's novel The Family of the Vourdalak.

[2][3][4] The patriarch of a wealthy family fears that he will show up one day in vampire form.

[1] The latter company was founded in 1971 by Roberto Maldera who also had a main role in the film, and Luigi Mariani.

[1] The Night of the Devils was shot in five weeks starting in late 1971 to early 1972 near Bracciano Lake.

[6] Andrews stated that despite "the brief surrealist promise of the opening scenes-a close-up of a face crawling with larvae cutting ingeniously to Niccola's head enveloped in the serpentine wires of an encephalograph", Night of the Devils had "all the usual defects of a low-budget horror quickie-careless direction, mechanical performances, some obtrusively unconvincing day-for-night sequences" find that the film "provides little in the way of style to compensate for a story which staggers dully from one bloodthirsty set-piece to another.