The Netflix show, The Fall of the House of Usher, ends tragically.
The great Usher house has fallen. Roderick and Madeline Usher are buried in the rubble. Viewers were left wondering why every single member of the family died under such hostile circumstances.
The answer is simple, as it was not an accident, or a curse, but a deal made years ago.
Roderick and Madeline Usher made a pact many years ago. They traded their family's future for power and wealth. The show's ending is the story of that deal coming to fruition. This article explains exactly what happened.
The Fall of the House of Usher: Ending explained

The deal in the bar
We must go back to the beginning to understand the end of The Fall of the House of Usher. The story flashes back to New Year's Eve 1979. Roderick and Madeline are young. They work for a drug company called Fortunato. But they want to take over the company. They murder their boss, Rufus Griswold, and hide his body in a basement wall.
So, now they go to a nearby bar in search of an alibi. The bar is empty, except for one bartender. Her name is Verna. Verna is not a normal person. She knows exactly what they did. She knows their names and their ambitions.
Then she offers them a deal where Roderick and Madeline will get everything they want. They will successfully run Fortunato and will get amazing wealth and power. They will also be safe, will never face legal consequences for any of their crimes.
But here's the twist. The deal has a price. And the price is not their souls, it is their family. Verna explains that when Roderick dies, his entire bloodline must die with him. This includes all his children and grandchildren. Madeline also agrees that she will die at the same time.
Shockingly, Roderick and Madeline accept the deal. They toast to their new future and choose power over a family they had yet to have in The Fall of the House of Usher.
Who is Verna?

Verna is the key to the whole story of The Fall of the House of Usher, and her name gives a clue. "Verna" is an anagram of "Raven," which points to the writer Edgar Allan Poe. Many of his poems and stories are used in the show. Verna is a supernatural being, not a human. She acts as fate, death, or a simple consequence.
She appears at critical moments in people's lives and offers them choices. She did not make Roderick and Madeline evil. They were already killers before they met her. Verna just gives them what they want. Then she collects the debt they agreed to pay. She is the force that balances the scales. The Ushers built a life on pain and death, so Verna delivers that pain and death back to them.
Paying the debt: The children
The main story takes place in the present, with an old Roderick Usher sitting in his ruined childhood home. He confesses everything to C. Auguste "Auggie" Dupin, the lawyer who tried to catch him for decades in The Fall of the House of Usher.
Roderick explains that all six of his children are dead, all dying within two weeks. Verna kept her promise and appeared to each of the Usher children. She gave them a chance to confess their sins, but they all failed.

So, she killed them one by one. Prospero, the youngest, threw a party where Verna, as a bartender, warned him to stop; he refused and died when acid sprayed the crowd. Camille, the PR chief, was killed by a chimpanzee, Verna in disguise, while spying at the company lab.
Napoleon, a drug addict, killed a cat and was haunted by Verna as another cat until he jumped to his death. Victorine, a surgeon, faked her invention and murdered her girlfriend, leading Verna to torment her into suicide.
Tamerlane, the wellness guru, was haunted by Verna in every mirror; she smashed them all, and a shard of glass fell and impaled her. Frederick, the eldest, tortured his wife, so Verna paralyzed him at a demolition site just as the building collapsed on him. Each death was a dark poem that mirrored the person's own crimes, and Verna was just the messenger.

The only good Usher
There was one good person in the family in The Fall of the House of Usher, that is, Lenore. She was Roderick's granddaughter. She was kind and smart and nothing like the others. Did Verna have to kill her, too? Yes. The deal was for the entire bloodline. No exceptions.
Verna's visit to Lenore was different. It was not cruel. She told Lenore that her mother would live, she would inherit a fortune and use that money to start a charity foundation. Verna told Lenore that her goodness would live on. Then, Lenore died peacefully in her sleep.
The final fall

Roderick ends his story by admitting he poisoned Madeline, hoping to escape their deal. He hid her body in the basement, preserved her, and replaced her eyes with blue stones, but the pact held firm. Madeline returns, blind and bleeding, and strangles Roderick to death.
As Auggie flees, the house collapses, burying the twins and ending the Usher bloodline. Only Juno and Arthur Pym survive. Juno inherits Fortunato, dissolves it, and uses the wealth to fund a drug rehabilitation charity. Pym rejects Verna’s offer of a deal, accepts his fate, and dies in prison.
The price was paid
The Fall of the House of Usher's end shows that Roderick and Madeline Usher destroyed themselves. Their choices led to ruin. They built wealth through lies, pain, and death. Every decision was a transaction with consequences. They believed they could escape justice. But they were wrong.
Verna did not punish them. She fulfilled the agreement. When the time came, she collected the price. No court or law could stop that.