It might be about discovery. If it's related to a scientific exploration of a vortex, the main theme could be the discovery of new knowledge about that particular vortex, be it a physical or a metaphorical one.
Another possibility is that the main theme is about change. If 'The Vortex, A True Story' is about people's lives being affected by a vortex - like force, it could be about how they change and adapt, or fail to do so, in the face of this force that disrupts their normal lives.
As I don't know the exact content, the main theme could be survival if it's about people in a dangerous vortex - like situation, such as a natural disaster.
As I haven't read it, the main theme could be about self - discovery. Maybe Jelly goes through a series of events that lead to understanding themselves better. This is a common theme in many true stories.
Since I don't know the exact 'The Town A True Story', it could have themes like community, as many town - based stories do. It might explore how the people in the town interact and support or conflict with each other.
Given that it's called 'unforgivable a true story', the main theme might be related to moral judgment. It could be exploring the idea that there are certain deeds in real life that cross a line and cannot be pardoned. For example, if it's a story about a war crime, the main theme would be the unforgivability of such an act from a moral and human perspective.
The main theme in 'true grit story' is often perseverance. The characters in the story show great determination in the face of difficulties.
It could be sacrifice. Maybe in the story, there are two characters represented by the two hearts, and one has to sacrifice something for the other. This sacrifice could be a central aspect that drives the story forward, showing the depth of their relationship or the significance of their situation.
Probably penitence itself. It might be about the feeling of remorse and the actions that follow it.
Since I don't know the exact 'no escape true story', the main theme could be struggle. If it's about being trapped, the characters would be struggling against whatever is holding them there.
The main theme might be about relaxation and recovery after sun - related activities.
Honesty. Pinocchio's nose grows when he lies, which is a very obvious symbol of the importance of being honest.
Since I don't know the details of 'Sparkle A True Story', I can't say for sure. But common themes in true stories could be hope, perseverance, or the power of human connection.