It depends on what you mean by 'real'. If you're asking if it's based on actual events, I'm not sure. Maybe it's fictional or inspired by some elements of reality.
I'm not certain. Since I'm not very familiar with these specific 'Kline Hannah' mystery novels, it's hard to say if they are popular. They could be a niche favorite or not well - known at all.
Greta is partially based on a true story. The filmmakers likely incorporated real-life elements and added fictional elements to make the story more engaging and cinematic.
There are indeed. A lot of fanfiction writers explore Jack Kline's character in different ways. For example, they might write about his struggle with his powers and how he tries to fit into the world of hunters. Some fanfictions also delve into his backstory more deeply, creating interesting twists and turns that you don't see in the original show.
Since I don't know who this Carl Kline is, it's difficult to say. However, if he's a freelancer, his top stories might cover a wide range of topics. For example, he could have written great pieces on environmental issues in his region, such as a successful tree - planting campaign. Or perhaps he has done some in - depth interviews with interesting local personalities, like an old - time craftsman who is keeping a traditional art alive.
If the 'greta big story' is about a particular event, then the people involved could be the organizers, the participants, and the witnesses. For example, if it's a community event, it might involve local residents, volunteers, and sponsors. If it's related to Greta Thunberg, it could involve other environmental activists, politicians she has interacted with, and the general public who support or oppose her ideas.