One possible theme could be mystery. A secret door often implies something hidden and unknown, which creates a sense of mystery.
Adventure could also be a theme. If the secret door leads to a new and exciting place, like a hidden underground tunnel or a different dimension, then the story could be about the adventure that unfolds as the characters explore what's beyond the door.
One possible theme could be friendship. Since it's about the friend next door, it's likely to focus on the relationship between neighbors who become friends.
One possible theme could be deception. The neighbor might have been deceiving everyone around them, pretending to be friendly while having evil intentions. Another theme could be the violation of trust. Neighbors are supposed to be people you can trust, but in this story, that trust is severely broken.
One possible theme could be mystery. There might be something strange or unexplained about the house next door.
One possible theme could be friendship. Since it's about the girl next door, it might focus on the bond that developed between the protagonist and the girl.
Another theme might be self - discovery. The girl could be on a journey to find out who she really is, perhaps trying different things and learning more about her own values and dreams. She might start out as a shy girl but through various encounters, she discovers her hidden strengths and capabilities. This could be a central theme in the story as it shows her growth and development.
One possible theme could be betrayal. If it's a scandal, there might be someone who has been betrayed, like in a case of corporate espionage where an employee betrays the company.
Another theme might be redemption. The characters in the 'the secret drama true story' could be trying to redeem themselves for past secrets or wrongdoings. For example, an actor who had a secret that could ruin their career might be on a journey to make things right.
One possible theme could be deception. The girl next door seems normal but is hiding something horrible.
Another theme might be the breakdown of trust in a community. When a crime happens to the girl next door, neighbors start to question their safety and the safety of those around them. It also could be about the search for justice. The story may focus on the efforts to find the perpetrator and make them pay for their crime, showing the importance of the justice system in such cases.
One possible theme could be friendship. Since it's about a girl next door, she might have formed strong friendships in the neighborhood in 1998. Another theme could be family, if her family played a role in the events of the story.