Well, in many fanfictions, Harry might use his knowledge of hidden places in the wizarding world like the Room of Requirement. He could also rely on the help of his friends. For example, Hermione might use her vast knowledge of spells to create a hiding place or a protective charm. And Ron could be there to offer physical protection if needed.
The 'city of refuge story' is mainly about the concept of cities of refuge in the Bible. These were special cities where someone who had accidentally killed another person could flee to for safety from the avenger of blood. It was a system of justice and mercy in that context.
The main theme could be about seeking sanctuary or a place of safety, as the title 'City of Refuge' often implies a place where people go to escape from something, perhaps danger, persecution or a difficult situation in the context of the novel.
In 'City of Refuge a Novel', the main characters could be diverse. There might be a family trying to escape a tyrannical regime. The father could be a man of principle, determined to protect his family. The mother could be the one holding the family together emotionally. And their children could represent the future and hope. There could also be a mysterious figure, perhaps an old hermit in the city of refuge who has his own secrets and knowledge that helps the newcomers in some way.
One challenge could be betrayal. There might be some so - called allies who are secretly working for Voldemort. Another is the lack of resources. If he is constantly on the run, he may not have access to enough food, water or magical supplies. And he has to be constantly vigilant against dark magic spells that Voldemort might send his way.
One example could be the hidden base in 'Star Wars'. The Rebel Alliance had secret refuges like Yavin 4 where they could hide from the Empire and plan their attacks. Another is in 'Dune' where the Fremen have secret sietches in the desert that serve as refuges from the Harkonnens.
Often, it's developed through the need for survival. When characters are facing powerful enemies or dangerous situations in science fiction, they create or find secret refuges. For example, in 'The Matrix', Zion is a secret refuge for those who have been freed from the Matrix.
Another possible theme is community. The city of refuge would need to have a sense of community for it to function as a place of safety. People within the city might support each other, share resources, and together create a haven. This could show how in difficult times, a community can be a powerful force for survival and growth.
There might also be characters who inhabit the city of refuge already. They could be guards or protectors of the city, ensuring that those who seek refuge are worthy and that the safety of the city is maintained. Or they could be ordinary citizens who have to deal with the influx of new people seeking safety.
I'm not sure specifically as I haven't read it yet. But generally, a novel about a character named Dewey Andreas might involve his adventures, challenges, and the story of his life, perhaps in a particular setting that serves as 'the last refuge'.