The theme of 'A Plague on Both Your Houses' could center on justice and the search for resolution. The plot could involve various events that intensify the enmity between the two houses and how it affects the lives of those within them.
I think the theme could be about the destructive nature of feuds and the toll they take on everyone involved. The plot might follow the characters' attempts to navigate and escape the chaos caused by the ongoing conflict between the two houses.
The main theme could be about conflict and the futility of feuds. It might show how the actions of two opposing sides, symbolized by 'both your houses', lead to destruction and chaos, much like a plague that affects everyone involved.
I'm not entirely sure as I haven't read this novel specifically, but typically in a story about two feuding 'houses', there would be leaders or representatives from each house as main characters. They would be the ones driving the conflict and making decisions that impact the situation.
One idea could be exploring the backstories of the characters in more depth. Maybe showing how they came to be in the situation that led to the 'plague on both houses'.
Another way to start is by introducing a new character or a new situation related to the 'plague on both houses'. For example, a mysterious traveler arrives at the time when the 'plague' is starting to spread. This traveler could have some knowledge or power that will either make the situation worse or better, and this can be the hook to start your fanfiction.
One of the recommended plague novels was La Peste, written by the French author Albert Camus. This novel was about an April in the 1940s. A catastrophic plague broke out in the city of Auland in North Africa. Thousands of people died from the disease, and Auland became an isolated island. The novel portrayed the struggle between life and death in the epidemic from the perspective of the third person, showing people's choices and struggles in the face of difficulties. The Plague vividly expressed the brave people who dared to face the bleak life, rose up in the absurd, and insisted on the great spirit of truth and justice. This novel was regarded as one of Camus 'representative works and won him a great reputation and status in the history of world literature.
The main theme is about the two dogs' struggle for survival and freedom. They are wrongly perceived as plague carriers and are chased. It shows their journey through the wild and how they face various challenges.
It's mainly about a family's struggle to survive during a widespread plague outbreak. They face many challenges and have to make tough decisions to stay alive.
The main theme could be about guilt and redemption. The characters in the story often struggle with past actions and the consequences that follow.
The main theme could be survival. After a plague, the characters might be struggling to survive in a world that has been turned upside down.
I haven't read it yet, so I'm not sure about the main plot.