The main theme of the story is:
'' Where there's a will, there's a way.
Journey by night is a story depicting the extraordinary power of human will. If we have the determination to do something, we can always find a way to do it. However, when he sees kunwar, his younger brother, writhing in pain, he makes up his mind to do everything possible to comfort him and provide him relief.He even takes decision to take him to the hospital, which is 50 miles away. On the way, he had to face several impediments.
But nothing could restrict him from his determination. Only through his courage, strong will of strength, fearlessness and his responsibility he saved his brother.
Therefore, Journey by night' is a tale of triumph of human courage.
hope it helps u :)