One possible theme could be redemption. If there is a character who has 'fallen', they might be seeking redemption. Another theme could be justice. DCI Matilda Darke is likely to be striving for justice in the story.
I haven't actually read this short story in detail. But generally, it might be about a case that DCI Matilda Darke is handling. The 'fallen' could refer to a victim, a suspect, or perhaps something symbolic like the fall of an institution or a person's moral fall.
As I don't know the story, I can't say for sure who Tanja Darke is in it. She could be the main character, perhaps a hero or a protagonist facing various challenges.
Matilda isn't a true story at all. It's a work of fiction that takes us into a imaginative world crafted by the writer for our enjoyment and inspiration.
Since I don't know the details of Tanja's Darke Story, it could be a story about Tanja Darke's life experiences. Maybe it involves her adventures, her relationships, or her achievements. Without more information, it's hard to say exactly what the story is about.
The story follows Matilda as she navigates a difficult home life and a less-than-friendly school, but finds strength and friendship along the way. There's a lot of magic, adventure, and heartwarming moments.