Following the success of What’s the Matter with Helen?, Curtis Harrington directed this intriguing psycho-biddy film. In it, Mrs. Rosie Forrest (Shelley Winters), the Aunty Roo of the title, is known by the children of a local orphanage as a kindly old lady who throws a huge Christmas party every single year for them. However, the truth is far more sinister. She’s obsessed with her dead daughter Katharine, whose mummified body lies in state in her attic so Aunty Roo can sing lullabies to her every night.

Mark Lester and Chloe Franks from The House That Dripped Blood play Christopher and Katy Coombs, two orphans who find themselves in Roo’s clutches. She believes that Katy might be her daughter, and the story takes a turn that’s reminiscent of the classic Hansel and Gretel tale, adding an intriguing layer to the narrative.

Ralph Richardson plays Mr. Benton, a fake psychic who tries to help Aunty Roo connect to the spirit of her long-departed daughter.

The early 70s are filled with what I call enjoyable junk. This would be one of those films with Winters practically devouring the scenery. It makes an outstanding double bill with the aforementioned What’s the Matter with Helen?, which is the superior of the two films. While Whoever Slew Auntie Roo? shares some thematic and stylistic similarities, it stands out for its more compelling narrative and character development.