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.
In the 'A Plague on Both Your Houses' novel, the theme may be related to the cycle of vengeance. The two houses could be locked in a cycle of attacking each other, and the title implies that this cycle is as destructive as a plague. It may also explore how this cycle affects the individuals within the houses, their relationships, and the society they are part of. The novel might be a critique of the pointless and self - destructive nature of such long - running feuds.
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.
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.
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.
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.
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 is about mortality and making the most of the time one has left. It shows how two strangers, upon learning that they will die at the end of the day, choose to experience life in different ways.
One of the main themes is the fragility of human existence. The plague in the novel suddenly disrupts the normal life of the town, showing how easily human life can be thrown into chaos. Another theme is the nature of heroism. Some characters step up to help others during the plague, like doctors and volunteers, which shows different forms of heroism.
The main theme is mortality. It shows how two people, despite knowing they will die at the end of the day, still find meaning, connection, and beauty in the time they have left.