A possible theme could be the search for the true meaning of marriage. In the first two marriages, the character may have had wrong ideas about what marriage should be. But in the third marriage, they finally understand that it's about sharing a life with someone in a way that is based on love, equality, and mutual support. It could also be about learning from past experiences and using that knowledge to build a better relationship in the third marriage.
One possible theme could be redemption. After two failed marriages, the character may find redemption in the third marriage, making up for past mistakes. Another theme could be growth. Through the experiences of three marriages, the character grows and changes.
One possible theme could be mystery. The act of knocking three times often creates an air of mystery, as it might be a signal for something unknown.
One possible theme could be community. Since it's a cafe, people from different walks of life might come together, creating a sense of community within the story.
One possible theme could be the allure of wealth and power through illegal means. Since it's about a heist king, the idea of getting rich quick through stealing valuable items would be central.
The theme of sacrifice might also be present. A married man may have to sacrifice certain things for the sake of his marriage and family, like giving up some personal hobbies or career opportunities. His story could be about how he has made these sacrifices and what he has gained in return.
One possible theme could be heroism. There were many heroes on 9/11, from the firefighters who rushed into the burning buildings to the passengers on Flight 93 who fought back against the hijackers.
One possible theme could be cooperation. Ants work together in many ways, like when they build their nests or find food.
One possible theme could be love. In many short stories, love in various forms such as romantic love, platonic love or love for family is a common theme. Another theme might be self - discovery. The characters in the story could be on a journey to find out more about themselves. Also, it could be about survival, especially if the story is set in a difficult or dangerous situation.
In the story'married to the devil's son 2', there might be a theme of identity. The girl may struggle to define herself in this new role as the wife of the devil's son. Another theme could be forgiveness. She might need to forgive the devil's son for his past actions or the actions of his family. And the theme of survival is also probable, as she has to survive in a world full of danger and evil associated with her marriage to the devil's son.
One possible theme is survival. Homeless people have to fight every day just to stay alive, which could be a central theme.
One possible theme could be hope. Even in a short story, the characters might be facing difficult situations but still hold on to hope. Another could be change, as short stories often show how a character or a situation can transform in a short period.