MacDara Conroy’s review published on Letterboxd:
Shoddy performances and an unfocused plot detract from the fittingly sleazy, Agatha-Christie-on-psychoactives atmosphere Mario Bava captures in one of his more celebrated films, which also happens to be the foundation of the slasher horror — Friday the 13th being a direct lift in all but its story, and its wicked twist of an ending.