Criminally Insane

Ethel murders her grandmother after the old woman threatens to call Dr. Gerard to address Ethel's uncontrollable binge eating. Ethel stabs her to death and then wrenches the cabinet key from her dead hand to gain access to the locked food supply. The murder is driven by Ethel's desperate need to satisfy her eating compulsion, which she perceives as being threatened.

Earlier, Ethel claims the institution staff tried to starve her, establishing her violent response to food restriction.

When the delivery boy arrives with groceries, Ethel cannot pay for the order. As he attempts to leave with the groceries, she attacks him with a broken bottle and stabs him to death. This murder follows the same pattern as her grandmother's killing - anyone who prevents her from obtaining food becomes a target.

The earlier conflict with her grandmother over food establishes that Ethel will use extreme violence to secure access to food.

Rosalie and John decide to break down the locked bedroom door because they cannot tolerate the growing stench from the room. Ethel learns of their plan and that night murders them both with a cleaver while they sleep. Their deaths eliminate two more witnesses to Ethel's crimes and add to her growing collection of bodies.

Rosalie complains about the smell emanating from the locked bedroom multiple times, signaling the danger they are in.

Ethel dismembers her victims and stuffs the body parts into sacks. She drives to a seaside area to dump them in the ocean, but too many witnesses are present. She brings the sacks back home and drags them inside, accidentally leaving her car trunk open. A neighbor spots a severed hand in the trunk and calls the police.

Ethel consistently takes actions to hide her crimes, from locking the bedroom to covering odors, showing her awareness of needing to conceal evidence.

Detective McDonough questions Ethel twice but she provides evasive and contradictory statements. Despite his growing suspicion, he lacks sufficient evidence to arrest her at that time. He leaves the house each time without resolving the case, allowing Ethel to continue her killings until he finally returns after the neighbor reports the severed hand.

Ethel's pattern of giving evasive answers during both interviews demonstrates her ability to manipulate investigators.

In the final scene, Detective McDonough walks in on Ethel eating one of her dead grandmother's arms. This horrific image represents the ultimate degradation of Ethel's mental state and her complete surrender to her cannibalistic impulses. The ending offers no redemption or resolution, leaving the story on a deliberately bleak note.

The earlier reveal that Ethel is cannibalistic (implied in the description) and the presence of her grandmother's body in the house foreshadow this final act.

Despite Dr. Gerard's unease about her discharge, Ethel is released from the institution into her grandmother's care. The specific reasons for her release are not detailed in the film, but the decision places a dangerous individual in a home environment where her extreme eating behaviors escalate into murder. Dr. Gerard's reluctance suggests the institution may have been negligent in assessing her readiness for release.

Dr. Gerard's expressed unease about the discharge directly foreshadows the violent events that follow.

Ethel's grandmother, Mrs. Janowski, empties the refrigerator and locks the cupboards to curb Ethel's binge eating. Her motivation is concern for Ethel's health and possibly fear about the mounting food bills. However, this action triggers Ethel's violent response, as she perceives the food restriction as a threat to her survival.

Ethel's claim that institution staff tried to starve her establishes her extreme reaction to food deprivation.