I'm not sure specifically as I haven't read the novel. But typically, in a novel with a title like this, there might be a protagonist who is perhaps a detective or an ordinary person drawn into extraordinary events that occur as night falls.
The main theme could be mystery. As night often symbolizes the unknown in literature, the novel might revolve around uncovering secrets that are hidden during the day and come to light as night falls.
The theme of 'When the Night Falls' might be centered around self-discovery and facing inner fears. The night could symbolize the hidden aspects of the characters' personalities that come to light.
As night fell, the city began to become quiet. Only the faint light of the lights flickered in the darkness. The leaves swayed gently in the breeze as if they were singing for this beautiful night. Everything became quiet and peaceful. Only the unique sense of tranquility in the depths of his heart remained.
As night fell, the lights in the city gradually went out, leaving only darkness. The sky gradually turned gloomy and the rain fell, wetting the ground. On this quiet night, people began to return home. The streets were empty except for some people who were in a hurry. Everything became quiet and peaceful. Only the sound of the breeze blowing the leaves made people feel a trace of peace.
I'm not sure specifically as I haven't read the novel in detail, but usually the main character would be someone who is central to the story's plot and themes, perhaps a person who is trying to break free from some form of bondage or is on a journey of self - discovery.
The main theme could be about the struggle against oppression. It might depict the journey of a character facing difficult circumstances in a society filled with restrictions and hardships.
I'm not sure as I haven't read the specific 'night falls in the city novel'. But it could have a detective as a main character who is trying to solve a mystery that is somehow related to the night - time activities in the city.
The main theme could be the transformation of the city at night. Maybe it focuses on the different characters' experiences during the night hours, like how they face their personal demons or find solace in the nocturnal cityscape.