Serenity arrives on the planet Kerry — more specifically the township of Kenmare, out on the continent of Killarney. They’re carrying cargo meant for the Duke of the township, one Duke Tarmon Farranfore, who surprises Mal not just with his payment, but with his hospitality. The Duke and his Duchess, Jin Mengyao, open their home to the crew, and soon everyone’s making acquaintances: River dances, Wash and Zoë steal some time together, Jayne drinks, Simon lends a hand in the hospital, Kaylee chats up half the township, and Inara takes on work with Kenmare’s highly regarded General, Li Xiuying. The Duke gives the crew free rein of his walled‑off township, safe and shining like a little slice of the Alliance.

Everything feels cosy here — too cosy — but Mal sees no reason to doubt the Duke’s kindness, especially with the promise of more work. Only Zoë feels that itch between her shoulders, the kind that says something ain’t right. She notices the Duchess acting strangely, though she can’t yet say why. Shepherd Book, following his instincts, wanders beyond the township walls and into the harsh landscape. What he finds is desperation. The Abbess of a nearby settlement has begun feeding the starving folk living under the Duke’s rule as best she can.

Where the rich live well, the towns beyond are dying slow. Book is horrified — and he commits himself to helping them.

Uneasy, Mal, Zoë, and Jayne follow after Book and find a town on its knees: no running water, poverty everywhere, children selling scraps while their parents toil in the fields, queue for food at the Abbey, or have simply vanished. Mal’s temper flares. He wants words with the Duke — but instead finds himself and his crew caught between a skirmish between the townsfolk and the Duke’s guards.

Back in Kenmare, Mal confronts the Duke, but again finds no crack in the man’s story. The Duke speaks of insurgents rebelling against his leadership and invites the crew to another grand gathering that evening.

But the night brings horror. What the Duke calls “another insurgent attack” is stopped by Devil’s Thorns — an illegal weapon so gruesome even the Alliance outlawed it. A cluster bomb filled with metal shards that, once in the blood, eat a body alive, joint by joint, leaving the victim paralysed. Mal and Zoë are appalled. They insist on going outside the township to retrieve Book and tend to the dead. They’ve seen this kind of cruelty before — during the War.

To keep Serenity safe, Mal orders the ship off‑world. Wash, River, and Kaylee lift into orbit, while Simon stays behind to help in the hospital where the wounded will be taken.

After helping the townsfolk and hearing their truth, Mal realises the Duke is the villain of this tale. Zoë was right. The Devil’s Thorns are new to the so‑called rebels — which means Serenity’s cargo was the illegal tech. Furious, Mal confronts the Duke again. The man tries to defend himself, but Mal’s done listening. He plans to leave as soon as he can.

Inara’s appointment ends, and a servant arrives to escort them to her client’s home. Instead, through a hidden underground passage, Mal, Zoë, and Jayne are brought before General Li, the Duchess, the Abbess, Book, and a gathering of insurgents. A Rebellion. They plan to take the Duke down and let the people govern themselves — but they need Mal’s help.

Under Mal’s orders, Wash retrieves Resistance fighters from Kerry’s moon. The plan: land Serenity inside the compound to deliver reinforcements, while Simon, Book, and Jayne destroy the Devil’s Thorns by any means necessary. As Mal and Zoë confront the Duke, he tries to pretend nothing’s happening — but Zoë’s had enough of the misogynistic worm. She holds back only long enough for the Duchess to stride in and order her husband marched through the streets to the nearest cell to await trial. It may take some time — she’s got a government to rebuild first.

The Duchess doubles Mal’s original fee, even though he’d already destroyed the weapons out of sheer moral fury. Nobody should wield that kind of cruelty.

On her shuttle, the General joins Inara for a cup of tea, thanking her for her assistance, in affairs both professional and personal. Mal still sees the sadness though, and she still intends to leave Serenity. But for now the crew is fed, rested, and given a little time off.

That’ll do him for now.