Love is likely a major theme. Despite the secrecy, there must be some form of love between the billionaire and his wife.
One of the main themes is secrecy itself. The fact that the marriage is a secret drives the plot in many ways. There's also the theme of love against all odds. Despite the challenges of being in a secret relationship, the couple usually has strong feelings for each other. And then there's the theme of social status. The difference in social status between the billionaire and perhaps the more 'normal' wife can lead to interesting plot developments like her trying to fit into his high - society world.
The theme of ambition might be present. She became a billionaire, so there must have been some ambition driving her. The novel could delve into her journey to reach that status, the challenges she faced, and how she overcame them. Additionally, the contrast between the wealthy and non - wealthy characters could be a theme, highlighting the differences in their lifestyles, values, and opportunities.
One possible theme could be transformation. Maybe the story shows how the protagonist's life is transformed by their interaction with the billionaire. Another theme might be secrecy itself, exploring why the billionaire has secrets and how they are kept or revealed.
One possible plot is that the ex - wife has to fight for her share of the assets after the divorce. The billionaire might try to cut her off unfairly, leading to a legal battle.
Love and family are main themes. Despite the complex situation of the secret baby, the characters often have to navigate their feelings towards each other and towards the new family they've unknowingly created.
It's possible that the main plot focuses on the power struggle between Aria and Adam. Since Adam is a billionaire, he may have a certain level of control and influence. But Aria, as his ex - wife, might not be as powerless as he thinks. She could be fighting for her rights, for a share in something, or just for her own self - respect. And this power struggle could be set against the backdrop of their past relationship, with flashbacks and revelations that add depth to the story.
Love could be a theme. Maybe his hidden obsession is a forbidden love, which would add a lot of drama to the story. Since he is a billionaire, there could be many obstacles in the way of this love due to differences in social status, family expectations, etc.
Social differences could be a major theme. The billionaire is in a different social stratum compared to the accidental bride, and the story may explore how they bridge that gap. Also, family drama might be present. Their families could have different reactions to the accidental marriage, which adds to the story's complexity.
The 'billionaire's secret wife novel' could potentially have a story full of drama. Maybe the billionaire has some family obligations or business deals that make him keep his marriage a secret. The wife might face challenges such as dealing with the billionaire's high - society friends or family who don't approve of her. It could also be a story of how their relationship developed in secrecy and how they navigate through the difficulties that come with such a situation.
One common theme is self - discovery. The heiress usually has to figure out who she really is now that she has this new identity.