"The Tell-Tale Heart"
Okay so I want to preface this that I have not read much Edgar Allen Poe so I will be missing those layers in my perspective, but anyways something that really struck me in "The Tell-Tale Heart" episode of The Fall of The House of Usher was the moments after Victorine throws the book end at Ali.
Before this, we're presented with this version of Victorine who may be stressed and pressured but ultimately does not actively appear to be amoral. She's just being put in a bad position by her shit father; she wants to do good and develop a life-saving medical device, and she just has to cut corners to stay afloat. It's only Camille who seems convinced Victorine is some awful person.
Then, the bookend. Another cut corner. Instead of talking things out with Ali or being patient, she acts impulsively and immediately to stop the problem. It's just like the first time she dosed the chimpanzee with epinephrine during surgery in a panic when she realized the device wasn't working. She hits Ali in the head and, on realizing the severity of her actions, runs over to her.
Ali is bleeding out on the floor, her body writhing horribly and she lets out these awful choked noises. Victorine goes to her and seems immediately horrified and brokenhearted. Then, the security guard checks in through the door. The guard is concerned over the scuffling noises overheard.
And Victorine fucking says to him, "Have you never heard a woman getting eaten out before?"
Her girlfriend is dying by her hand, and she pretends the sounds of her dying are the noises of sexual pleasure. This to me is the reveal, this is when the audience truly sees that Victorine does not have and never had a heart. The love she's shown, for her passion, her girlfriend, her device, is nothing more than mistaken greed. It's a mechanical heartbeat, it sounds almost like a heartbeat, but it's a pale imitation to anyone who pays attention. And like with Ali's corpse, the mechanical heart of Victorine is just keeping a soulless body alive.
The Fall of the House of Usher structurally represents the family itself: it begins with the announcement of the deaths of all the children. The children are dead from the beginning of the show. And as Annabel points out, the children in the story were dead from the start, killed by greed and wealth. And then we learn that they were literally dead, as Roderick and Madeline had already sold their lives for wealth before they were even born. We're not seeing the family die, we're seeing the final moments of corpses decomposing. We're seeing the dilapidated house finally collapse. The Fall of the House of Usher is not about death, it's about the walking dead, like the visions of Roderick. A family kept alive with a mechanical device just going through the motions.