Mad Room

Ellen Hardy (Stella Stevens) is employed as caretaker/companion to Gladys Armstrong (Shelly Winters), a wealthy widow. When Ellen's two younger siblings, George (Michael Burns) and Mandy (Barbara Sammeth) - the prime suspects in their parents' murder - are released from a mental institution, they come to stay with her and Gladys. Furious after the siblings turn her late husband's study into a "mad room"- a place where they can be alone - Gladys orders them out of her house. That evening, she's found hacked to pieces and George and Mandy suspect each other of the crime. Ellen finally admits to all the murders and goes completely insane.