“The Last Thing Mary Saw is so effective as a vehicle for performances, atmosphere, and period detail... that one may wish that it added up to more.” Roger Ebert · 4 years ago The Last Thing Mary Saw (2021) - IMDb

Reviewers generally found the film's mood exceptional but were divided on its pacing and narrative clarity.

Critics from PopHorror and other outlets praised the raw chemistry between Stefanie Scott and Isabelle Fuhrman.

Judith Roberts delivers a terrifying performance as the family's matriarch, while Rory Culkin makes an "effortlessly creepy" appearance in the second half.

“There are cracks in the icy mood of this austere, slow-paced horror.” Rotten Tomatoes